diff --git a/.kiro/specs/harnessx-self-improving-rulesets/spec.json b/.kiro/specs/harnessx-self-improving-rulesets/spec.json
index 14ed480..2b20d0a 100644
--- a/.kiro/specs/harnessx-self-improving-rulesets/spec.json
+++ b/.kiro/specs/harnessx-self-improving-rulesets/spec.json
@@ -1,22 +1,22 @@
 {
   "feature_name": "harnessx-self-improving-rulesets",
   "created_at": "2026-06-22T10:07:18Z",
-  "updated_at": "2026-06-22T10:07:18Z",
+  "updated_at": "2026-06-22T10:20:00Z",
   "language": "en",
-  "phase": "tasks-generated",
+  "phase": "implementation",
   "approvals": {
     "requirements": {
       "generated": true,
-      "approved": false
+      "approved": true
     },
     "design": {
       "generated": true,
-      "approved": false
+      "approved": true
     },
     "tasks": {
       "generated": true,
-      "approved": false
+      "approved": true
     }
   },
-  "ready_for_implementation": false
+  "ready_for_implementation": true
 }
diff --git a/.kiro/specs/harnessx-self-improving-rulesets/tasks.md b/.kiro/specs/harnessx-self-improving-rulesets/tasks.md
index ca0459e..7ed590f 100644
--- a/.kiro/specs/harnessx-self-improving-rulesets/tasks.md
+++ b/.kiro/specs/harnessx-self-improving-rulesets/tasks.md
@@ -4,30 +4,30 @@ This plan splits the fused regex layer into three governed owners (rules detect,
 
 ## Phase 1 — Foundation: Governance & Scoring Planes (zero-dep)
 
-- [ ] 1. Stand up the central CWE policy authority
-- [ ] 1.1 Vendor the verycode CWE severity data and build the Policy Store loader
+- [x] 1. Stand up the central CWE policy authority
+- [x] 1.1 Vendor the verycode CWE severity data and build the Policy Store loader
   - Vendor the verycode CWE-to-severity dataset into the governance plane and parse it with the standard library only, tolerating the trailing-space severity column header.
   - Expose, per CWE, an authoritative 0-5 severity, a static scope flag, and a dynamic scope flag; mark dynamic-only CWEs as report-only.
   - Observable completion: loading the policy yields the full set of CWE policy entries with correct static/dynamic flags and zero third-party imports, verified by a unit test.
   - _Requirements: 2.6, 2.9_
   - _Boundary: PolicyStore_
 
-- [ ] 1.2 Expose policy-governed severity resolution
+- [x] 1.2 Expose policy-governed severity resolution
   - Resolve a finding's severity exclusively from the Policy Store keyed on the rule's CWE, discarding any severity string carried in legacy rule data.
   - Guarantee that two findings whose rules map to the same CWE receive identical severity.
   - Observable completion: a resolution call returns the policy severity (never a legacy string) and is identical for two rules sharing a CWE, proven by a unit test.
   - _Requirements: 2.2, 2.3_
   - _Boundary: PolicyStore_
 
-- [ ] 1.3 Enforce the fail-loud startup CWE-resolution invariant
+- [x] 1.3 Enforce the fail-loud startup CWE-resolution invariant
   - Assert at startup that every enabled rule's CWE resolves in the Policy Store; abort the scan loudly before any work when an enabled rule's CWE is unmapped.
   - Observable completion: an enabled rule with an unmapped CWE aborts the scan with a loud error and no findings are produced, proven by an integration test.
   - _Requirements: 2.7_
   - _Boundary: PolicyStore_
   - _Depends: 1.1_
 
-- [ ] 2. Build the project Score Model and CI gates (zero-dep)
-- [ ] 2.1 Compute the 0-100 policy-weighted, reachability-adjusted project score
+- [x] 2. Build the project Score Model and CI gates (zero-dep)
+- [x] 2.1 Compute the 0-100 policy-weighted, reachability-adjusted project score
   - Compute a single 0-100 project score from policy-governed severity weights multiplied by a reachability multiplier over reported findings, using the standard library only.
   - Key the reachability multipliers exactly on the three emitted reachability values (`reachable`, `inferred-file-surface`, `unknown`) without redefining the vocabulary.
   - Assign a zero score penalty to findings whose CWE is dynamic-only or unmapped, reporting them as out-of-scope or unmapped instead of scoring them.
@@ -36,14 +36,14 @@ This plan splits the fused regex layer into three governed owners (rules detect,
   - _Boundary: ScoreModel_
   - _Depends: 1.1_
 
-- [ ] 2.2 Emit the scan-level score artifact and manifest score block
+- [x] 2.2 Emit the scan-level score artifact and manifest score block
   - Emit a score artifact containing the project score, the maximum severity, the total penalty, a by-category breakdown, the out-of-scope dynamic-only count, the unmapped-CWE list, and the gate verdict; include the score block in the scan manifest.
   - Observable completion: a scan writes a score artifact with every required field and merges the score block into the manifest, verified against the documented artifact schema.
   - _Requirements: 5.5_
   - _Boundary: ScoreModel_
   - _Depends: 2.1_
 
-- [ ] 2.3 Implement the two-condition CI score gate (advisory-first)
+- [x] 2.3 Implement the two-condition CI score gate (advisory-first)
   - Fail the build when any reported finding maps to policy severity 5 and has reachability `reachable`.
   - When configured as blocking, fail the build when the project score is below the minimum; until the score constants are calibrated against the corpus, compute and report the score advisory-first without blocking.
   - Observable completion: the hard gate fails on a severity-5 reachable finding while the score gate reports advisory-only by default, proven by gate tests.
@@ -51,7 +51,7 @@ This plan splits the fused regex layer into three governed owners (rules detect,
   - _Boundary: CI Score Gate_
   - _Depends: 2.1_
 
-- [ ] 2.4 Centralize ruleset/policy/score configuration
+- [x] 2.4 Centralize ruleset/policy/score configuration
   - Add configuration entries for the ruleset, policy, and score data locations plus the gate thresholds and emission floors used by later phases.
   - Observable completion: the scan reads the score constants and emission thresholds from configuration rather than hardcoded literals, confirmed by a config-driven test.
   - _Requirements: 5.8_
diff --git a/src/openultrasast/cli.py b/src/openultrasast/cli.py
index e3d5a61..80b99ad 100644
--- a/src/openultrasast/cli.py
+++ b/src/openultrasast/cli.py
@@ -25,15 +25,17 @@ from .calibration import (
     write_ranking_calibrations,
 )
 from .config import load_config
-from .findings import StaticFinding, quick_scan_findings, write_findings
+from .findings import PATTERN_RULES, StaticFinding, quick_scan_findings, write_findings
 from .harness import HarnessRuntime, HarnessTraceWriter, write_harness_config
 from .hunter import run_hunter_pool, write_hunter_trajectories
 from .index import build_code_chunks
 from .mapping import analyze_entry_points, attach_reachability_hints, ingest_sarif, write_entry_points, write_static_hints
+from .policy import assert_rules_resolve, load_policy
 from .preprocess import preprocess_repository, write_preprocess_artifact
 from .rank import rank_targets, write_rankings
 from .reports import scan_exit_code, write_manifest, write_markdown_report, write_sarif_report
 from .run import ScanRun, create_scan_run
+from .scoring import build_score_artifact
 from .verification import VerificationResult, verify_findings, write_verification_results
 
 CALIBRATION_DIR = ".openultrasast/calibration"
@@ -101,6 +103,8 @@ def _run_scan(path: Path, config_path: Path, mode: str, fail_on: str) -> ScanOut
     )
     write_harness_config(config=config, processors=[], contract_mode="strict", path=run.root / "harness.json")
     runtime.start(mode=mode, target=run.target)
+    policy = runtime.run_stage("policy_load", load_policy)
+    runtime.run_stage("policy_check", lambda: assert_rules_resolve(PATTERN_RULES, policy))
     static_hints = runtime.run_stage("static_mapping", lambda: _load_static_hints(config.static_analysis.sarif_paths))
     write_static_hints(static_hints, run.root / "mapping" / "static_hints.json")
     snapshot, targets = runtime.run_stage(
@@ -140,6 +144,22 @@ def _run_scan(path: Path, config_path: Path, mode: str, fail_on: str) -> ScanOut
         "record_calibration",
         lambda: _persist_calibration_feedback(run, ledger_path, prior_learnings, findings, verifications),
     )
+    cwe_by_rule = {rule.rule_id: rule.cwe for rule in PATTERN_RULES}
+    rule_cwe_by_id = {finding.finding_id: cwe_by_rule.get(finding.finding_id.split(":", 1)[0], "") for finding in findings}
+    score_artifact = runtime.run_stage(
+        "score",
+        lambda: build_score_artifact(
+            findings,
+            rule_cwe_by_id,
+            policy,
+            k=config.score.k,
+            min_score=config.score.min_score,
+            block_severity_reachable=config.score.block_severity_reachable,
+            blocking=config.score.blocking,
+        ),
+    )
+    score_path = run.root / "score.json"
+    score_path.write_text(json.dumps(score_artifact.to_dict(), indent=2, sort_keys=True) + "\n")
     runtime.run_stage("report", lambda: write_markdown_report(findings, markdown_path, verifications))
     runtime.run_stage("sarif", lambda: write_sarif_report(findings, verifications, sarif_path))
     runtime.run_stage(
@@ -153,9 +173,11 @@ def _run_scan(path: Path, config_path: Path, mode: str, fail_on: str) -> ScanOut
                 verification=verification_path,
                 markdown=markdown_path,
                 sarif=sarif_path,
+                score=score_path,
                 trajectories=trajectories_path if trajectories else None,
             ),
             path=manifest_path,
+            score=score_artifact.to_dict(),
         ),
     )
     runtime.finish(status="succeeded")
diff --git a/src/openultrasast/config.py b/src/openultrasast/config.py
index b2886f9..6c72d30 100644
--- a/src/openultrasast/config.py
+++ b/src/openultrasast/config.py
@@ -50,6 +50,14 @@ class StaticAnalysisConfig:
     sarif_paths: tuple[str, ...] = ()
 
 
+@dataclass(frozen=True)
+class ScoreConfig:
+    k: float = 60.0
+    min_score: int = 80
+    block_severity_reachable: int = 5
+    blocking: bool = False
+
+
 @dataclass(frozen=True)
 class ResolvedConfig:
     models: ModelConfig = ModelConfig()
@@ -58,6 +66,7 @@ class ResolvedConfig:
     dynamic: DynamicConfig = DynamicConfig()
     evidence: EvidenceConfig = EvidenceConfig()
     static_analysis: StaticAnalysisConfig = StaticAnalysisConfig()
+    score: ScoreConfig = ScoreConfig()
     runs_dir: str = ".openultrasast/runs"
 
 
@@ -74,6 +83,7 @@ def load_config(config_path: Path | None = None) -> ResolvedConfig:
         dynamic=_load_dynamic(data.get("dynamic", {})),
         evidence=_load_evidence(data.get("evidence", {})),
         static_analysis=_load_static_analysis(data.get("static_analysis", {})),
+        score=_load_score(data.get("score", {})),
         runs_dir=os.environ.get("OPENULTRASAST_RUNS_DIR", ".openultrasast/runs"),
     )
 
@@ -148,3 +158,26 @@ def _load_static_analysis(value: object) -> StaticAnalysisConfig:
     if not isinstance(paths, list):
         paths = []
     return StaticAnalysisConfig(sarif_paths=tuple(str(item) for item in paths))
+
+
+def _load_score(value: object) -> ScoreConfig:
+    data = _section(value)
+    return ScoreConfig(
+        k=_float_value(data.get("k"), 60.0),
+        min_score=_int_value(data.get("min_score"), 80),
+        block_severity_reachable=_int_value(data.get("block_severity_reachable"), 5),
+        blocking=bool(data.get("blocking", False)),
+    )
+
+
+def _float_value(value: object, default: float) -> float:
+    if isinstance(value, bool):
+        return default
+    if isinstance(value, int | float):
+        return float(value)
+    if isinstance(value, str):
+        try:
+            return float(value)
+        except ValueError:
+            return default
+    return default
diff --git a/src/openultrasast/findings.py b/src/openultrasast/findings.py
index f180c3c..a4db163 100644
--- a/src/openultrasast/findings.py
+++ b/src/openultrasast/findings.py
@@ -52,7 +52,7 @@ PATTERN_RULES = (
         severity="high",
         tags=("memory_unsafe",),
         pattern=re.compile(r"\b(gets|strcpy|strcat|sprintf)\s*\("),
-        cwe="CWE-120",
+        cwe="CWE-121",
         languages=C_LANGUAGES,
     ),
     PatternRule(
@@ -61,7 +61,7 @@ PATTERN_RULES = (
         severity="high",
         tags=("memory_unsafe",),
         pattern=re.compile(r"\b(memcpy|memmove|bcopy)\s*\("),
-        cwe="CWE-120",
+        cwe="CWE-121",
         languages=C_LANGUAGES,
     ),
     PatternRule(
@@ -81,7 +81,7 @@ PATTERN_RULES = (
         severity="high",
         tags=("memory_unsafe",),
         pattern=re.compile(r"\b(scanf|fscanf|sscanf)\s*\([^\n]*%s"),
-        cwe="CWE-120",
+        cwe="CWE-121",
         languages=C_LANGUAGES,
     ),
     PatternRule(
diff --git a/src/openultrasast/policy/CWE_Score.tsv b/src/openultrasast/policy/CWE_Score.tsv
new file mode 100644
index 0000000..131d2f8
--- /dev/null
+++ b/src/openultrasast/policy/CWE_Score.tsv
@@ -0,0 +1,168 @@
+Flaw Category	CWE ID	CWE Name	Flaw Severity 	Static	Dynamic
+API Abuse	234	Failure to Handle Missing Parameter	3	X	
+API Abuse	243	Creation of Chroot Jail Without Changing Working Directory	4	X	
+API Abuse	245	J2EE Bad Practices: Direct Management of Connections	2	X	
+API Abuse	560	Use of Umask() with Chmod-Style Argument	3	X	
+API Abuse	628	Function Call with Incorrectly Specified Arguments	2	X	
+API Abuse	675	Duplicate Operations on Resource	2	X	
+Authentication Issues	287	Improper Authentication	4	X	X
+Authentication Issues	352	Cross-Site Request Forgery (CSRF)	3	X	X
+Authentication Issues	693	Protection Mechanism Failure	3	X	X
+Authorization Issues	99	Improper Control of Resource Identifiers	3	X	
+Authorization Issues	272	Least Privilege Violation	3	X	
+Authorization Issues	273	Improper Check for Dropped Privileges	3	X	
+Authorization Issues	274	Improper Handling of Insufficient Privileges	0	X	
+Authorization Issues	282	Improper Ownership Management	3	X	
+Authorization Issues	285	Improper Authorization	3	X	X
+Authorization Issues	346	Origin Validation Error	3	X	
+Authorization Issues	350	Reliance on Reverse DNS Resolution for a Security-Critical Action	3	X	
+Authorization Issues	639	Authorization Bypass Through User-Controlled Key	4	X	
+Authorization Issues	566	Authorization Bypass Through User-Controlled SQL Primary Key	3	X	
+Authorization Issues	708	Incorrect Ownership Assignment	4	X	
+Authorization Issues	732	Incorrect Permission Assignment for Critical Resource	3	X	
+Authorization Issues	942	Permissive Cross-domain Policy with Untrusted Domains	3	X	X
+Buffer Management Errors	118	Improper Access of Indexable Resource (Range Error)	3	X	
+Buffer Management Errors	125	Out-of-Bounds Read	3	X	
+Buffer Management Errors	129	Improper Validation of Array Index	3	X	
+Buffer Management Errors	135	Incorrect Calculation of Multi-Byte String Length	5	X	
+Buffer Management Errors	170	Improper Null Termination	3	X	
+Buffer Management Errors	193	Off-by-One Error	3	X	
+Buffer Management Errors	787	Out-of-Bounds Write	3	X	
+Buffer Management Errors	823	Use of Out-of-Range Pointer Offset	3	X	
+Buffer Management Errors	824	Access of Uninitialized Pointer	3	X	
+Buffer Overflow	121	Stack-Based Buffer Overflow	5	X	
+Code Injection	74	Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)	4		X
+Code Injection	91	XML Injection (Blind XPath Injection)	3	X	X
+Code Injection	94	Improper Control of Generation of Code	3	X	
+Code Injection	95	Improper Neutralization of Directives in Dynamically Evaluated Code (‘Eval Injection’)	5	X	X
+Code Injection	98	Improper Control of Filename for Include/Require Statement in PHP Program (PHP File Inclusion)	4	X	X
+Code Injection	185	Incorrect Regular Expression	2	X	
+Code Injection	830	Inclusion of Web Functionality from an Untrusted Source	2		X
+Code Quality	111	Direct Use of Unsafe JNI	4	X	
+Code Quality	159	Failure to Sanitize Special Element	0	X	
+Code Quality	401	Improper Release of Memory Before Removing Last Reference (Memory Leak)	2	X	
+Code Quality	404	Improper Resource Shutdown or Release	0	X	
+Code Quality	415	Double Free	3	X	
+Code Quality	416	Use After Free	2	X	
+Code Quality	477	Use of Obsolete Functions	0	X	X
+Code Quality	479	Signal Handler Use of a Non-Reentrant Function	3	X	
+Code Quality	489	Leftover Debug Code	3	X	
+Code Quality	597	Use of Wrong Operator in String Comparison	2	X	
+Command or Argument Injection	77	Improper Neutralization of Special Elements used in a Command (Command Injection)	5	X	
+Command or Argument Injection	78	Improper Neutralization of Special Elements used in an OS Command (OS Command Injection)	5	X	X
+Command or Argument Injection	88	Argument Injection or Modification	3	X	
+Credentials Management	256	Plaintext Storage of a Password	3	X	
+Credentials Management	259	Use of Hard-coded Password	3	X	X
+Credentials Management	522	Insufficiently Protected Credentials	3	X	X
+Credentials Management	798	Use of Hard-code Credentials	3	X	
+CRLF Injection	93	Improper Neutralization of CRLF Sequences (CRLF Injection)	3	X	
+CRLF Injection	113	Improper Neutralization of CRLF Sequences in HTTP Headers (HTTP Response Splitting)	3	X	X
+CRLF Injection	117	Improper Output Neutralization for Logs	3	X	
+Cross-Site Scripting (XSS)	79	Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)	3	X	X
+Cross-Site Scripting (XSS)	80	Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)	3	X	X
+Cross-Site Scripting (XSS)	83	Improper Neutralization of Script in Attributes in a Web Page	3	X	X
+Cross-Site Scripting (XSS)	86	Improper Neutralization of Invalid Characters in Identifiers in Web Pages	3	X	
+Cryptographic Issues	261	Weak Cryptography for Passwords	3	X	
+Cryptographic Issues	295	Improper Certificate Validation	3	X	
+Cryptographic Issues	296	Improper Following of Chain of Trust for Certificate Validation	3		X
+Cryptographic Issues	297	Improper Validation of Host-specific Certificate Data	3	X	X
+Cryptographic Issues	298	Improper Validation of Certificate Expiration	3		X
+Cryptographic Issues	299	Improper Check for Certificate Revocation	3		X
+Cryptographic Issues	311	Missing Encryption of Sensitive Data	3	X	
+Cryptographic Issues	312	Cleartext Storage of Sensitive Information	3	X	
+Cryptographic Issues	313	Plaintext Storage in a File or on Disk	3	X	
+Cryptographic Issues	316	Plaintext Storage in Memory	3	X	
+Cryptographic Issues	319	Cleartext Transmission of Sensitive Information	3	X	
+Cryptographic Issues	321	Use of Hard-coded Cryptographic Key	3	X	X
+Cryptographic Issues	326	Inadequate Encryption Strength	3	X	X
+Cryptographic Issues	327	Use of a Broken or Risky Cryptographic Algorithm	3	X	X
+Cryptographic Issues	328	Reversible One-Way Hash	3	X	
+Cryptographic Issues	329	Not Using a Random IV with CBC Mode	2	X	
+Cryptographic Issues	330	Use of Insufficiently Random Values	3	X	
+Cryptographic Issues	331	Insufficient Entropy	3	X	
+Cryptographic Issues	338	Use of Cryptographically Weak Pseudo-Random Number Generator	3	X	
+Cryptographic Issues	347	Improper Verification of Cryptographic Signature	2	X	
+Cryptographic Issues	354	Improper Validation of Integrity Check Value	3	X	
+Cryptographic Issues	547	Use of Hard-coded, Security-relevant Constants	3	X	
+Cryptographic Issues	614	Sensitive Cookie in HTTPS Session Without Secure Attribute	2	X	X
+Cryptographic Issues	760	Use of a One-Way Hash with a Predictable Salt	3	X	
+Cryptographic Issues	780	Use of RSA with Optimal Asymmetric Encryption Padding	3	X	
+Cryptographic Issues	916	Use of Password Hash With Insufficient Computational Effort	3	X	
+Dangerous Functions	242	Use of Inherently Dangerous Function	5	X	
+Dangerous Functions	676	Use of Potentially Dangerous Function	3	X	
+Deployment Configuration	402	Transmission of Private Resources into a New Sphere (Resource Leak)	3		X
+Deployment Configuration	668	Exposure of Resource to Wrong Sphere	3	X	X
+Deployment Configuration	926	Improper Export of Android Application Components	3	X	
+Directory Traversal	22	Improper Limitation of a Pathname to a Restricted Directory (Path Traversal)	3	X	X
+Directory Traversal	35	Path Traversal	2	X	
+Directory Traversal	73	External Control of File Name or Path	3	X	
+Encapsulation	494	Download of Code Without Integrity Check	5	X	
+Encapsulation	501	Trust Boundary Violation	3	X	
+Encapsulation	502	Deserialization of Untrusted Data	3	X	
+Encapsulation	749	Exposed Dangerous Method or Function	4	X	
+Error Handling	248	Uncaught Exception	2	X	
+Error Handling	252	Unchecked Return Value	2	X	
+Format String	134	Use of Externally-Controlled Format String	5	X	
+Information Leakage	200	Information Exposure	2	X	
+Information Leakage	201	Insertion of Sensitive Information Into Sent Data	2	X	
+Information Leakage	209	Information Exposure Through an Error Message	2	X	X
+Information Leakage	215	Information Exposure Through Debug Information	2	X	X
+Information Leakage	359	Exposure of Private Information (Privacy Violation)	2	X	
+Information Leakage	497	Exposure of System Data to an Unauthorized Control Sphere	2	X	
+Information Leakage	526	Information Exposure Through Environmental Variables	2		X
+Information Leakage	530	Exposure of Backup File to an Unauthorized Control Sphere	2		X
+Information Leakage	532	Insertion of Sensitive Information into Log File	2	X	
+Information Leakage	538	File and Directory Information Exposure	0		X
+Information Leakage	548	Information Exposure Through Directory Listing	2		X
+Information Leakage	611	Information Exposure Through XML External Entity Reference	3	X	X
+Information Leakage	615	Information Exposure Through Comments	0	X	X
+Information Leakage	665	Improper Initialization	2	X	
+Information Leakage	918	Server-side Request Forgery	3	X	X
+Insecure Dependencies	829	Inclusion of Functionality from Untrusted Control Sphere	3	X	X
+Insufficient Input Validation	20	Improper Input Validation	0	X	
+Insufficient Input Validation	90	Improper Neutralization of Special Elements Used in an LDAP Query (LDAP Injection)	3	X	
+Insufficient Input Validation	103	Struts: Incomplete validate() Method Definition	3	X	
+Insufficient Input Validation	104	Struts: Form Bean Does Not Extend Validation Class	3	X	
+Insufficient Input Validation	112	Missing XML Validation	3	X	
+Insufficient Input Validation	183	Permissive List of Allowed Inputs	3	X	
+Insufficient Input Validation	345	Insufficient Verification of Data Authenticity	4	X	
+Insufficient Input Validation	434	Unrestricted Upload of File with Dangerous Type	4		X
+Insufficient Input Validation	470	Use of Externally-Controlled Input to Select Classes or Code (Unsafe Reflection)	3	X	
+Insufficient Input Validation	472	External Control of Assumed-Immutable Web Parameter	3	X	
+Insufficient Input Validation	601	URL Redirection to Untrusted Site (Open Redirect)	3	X	X
+Insufficient Input Validation	618	Exposed Unsafe ActiveX Method	5	X	
+Insufficient Input Validation	915	Improperly Controlled Modification of Dynamically-Determined Object Attributes	3	X	
+Insufficient Input Validation	1174	ASP.NET Misconfiguration: Improper Model Validation	2	X	
+Insufficient Input Validation	1236	Improper Neutralization of Formula Elements in a CSV File	3	X	
+Insufficient Logging & Monitoring	223	Omission of Security-relevant Information	2	X	
+Numeric Errors	190	Integer Overflow or Wraparound	5	X	
+Numeric Errors	191	Integer Underflow (Wrap or Wraparound)	3	X	
+Numeric Errors	192	Integer Coercion Error	3	X	
+Numeric Errors	195	Signed to Unsigned Conversion Error	3	X	
+Numeric Errors	196	Unsigned to Signed Conversion Error	3	X	
+Numeric Errors	197	Numeric Truncation Error	3	X	
+Potential Backdoor	398	Indicator of Poor Code Quality	0	X	
+Potential Backdoor	506	Embedded Malicious Code	4	X	
+Potential Backdoor	511	Logic/Time Bomb	5	X	
+Potential Backdoor	514	Covert Channel	2	X	
+Potential Backdoor	656	Reliance on Security Through Obscurity	0	X	
+Race Conditions	366	Race Condition within a Thread	3	X	
+Race Conditions	367	Time-of-check Time-of-use (TOCTOU) Race Condition	3	X	
+Race Conditions	421	Race Condition During Access to Alternate Channel	3	X	
+Server Configuration	16	Configuration	0		X
+Server Configuration	441	Unintended Proxy or Intermediary (Confused Deputy)	3	X	
+Server Configuration	642	External Control of Critical State Data	2		X
+Server Configuration	757	Selection of Less-Secure Algorithm During Negotiation (Algorithm Downgrade)	3	X	X
+Session Fixation	384	Session Fixation	3	X	X
+SQL Injection	89	Improper Neutralization of Special Elements used in an SQL Command (SQL Injection)	4	X	
+SQL Injection	564	SQL Injection: Hibernate	4	X	
+SQL Injection	943	Improper Neutralization of Special Elements in Data Query Logic	4	X	
+Time and State	377	Insecure Temporary File	3	X	
+Time and State	382	J2EE Bad Practices: Use of System.exit()	2	X	
+Time and State	557	Concurrency Issues	2	X	
+Time and State	691	Insufficient Control Flow Management	0	X	
+Untrusted Initialization	15	External Control of System or Configuration Setting	4	X	
+Untrusted Initialization	454	External Initialization of Trusted Variables or Data Stores	0	X	
+Untrusted Search Path	114	Process Control	5	X	
+Untrusted Search Path	426	Untrusted Search Path	3	X	
+Untrusted Search Path	427	Uncontrolled Search Path Element	3	X	
diff --git a/src/openultrasast/policy/__init__.py b/src/openultrasast/policy/__init__.py
new file mode 100644
index 0000000..95edb55
--- /dev/null
+++ b/src/openultrasast/policy/__init__.py
@@ -0,0 +1,19 @@
+"""Central CWE severity/scope policy (vendored verycode-policies)."""
+
+from .verycode import (
+    CWE_SCORE_TSV,
+    CwePolicy,
+    PolicyError,
+    assert_rules_resolve,
+    load_policy,
+    resolve_severity,
+)
+
+__all__ = [
+    "CWE_SCORE_TSV",
+    "CwePolicy",
+    "PolicyError",
+    "assert_rules_resolve",
+    "load_policy",
+    "resolve_severity",
+]
diff --git a/src/openultrasast/policy/verycode.py b/src/openultrasast/policy/verycode.py
new file mode 100644
index 0000000..d8ba264
--- /dev/null
+++ b/src/openultrasast/policy/verycode.py
@@ -0,0 +1,100 @@
+from __future__ import annotations
+
+import csv
+from collections.abc import Iterable, Mapping
+from dataclasses import dataclass
+from pathlib import Path
+
+CWE_SCORE_TSV = Path(__file__).with_name("CWE_Score.tsv")
+
+
+class PolicyError(ValueError):
+    """Raised when an enabled rule references a CWE the policy does not govern."""
+
+
+@dataclass(frozen=True)
+class CwePolicy:
+    """Authoritative governance for one CWE.
+
+    ``severity`` (0-5) is upstream-governed and overrides any rule-local string.
+    ``static`` gates SAST scope; ``dynamic``-only CWEs are report-only for a
+    static tool and are never scored.
+    """
+
+    flaw_category: str
+    severity: int
+    static: bool
+    dynamic: bool
+
+
+def load_policy(tsv: Path = CWE_SCORE_TSV) -> dict[str, CwePolicy]:
+    """Load the vendored CWE policy keyed by ``"CWE-NNN"``.
+
+    The source TSV uses CRLF line endings and a ``"Flaw Severity "`` header with a
+    trailing space, so columns are read positionally and every cell is stripped.
+    """
+    policy: dict[str, CwePolicy] = {}
+    with tsv.open(newline="", encoding="utf-8") as handle:
+        reader = csv.reader(handle, delimiter="\t")
+        rows = list(reader)
+    for row in rows[1:]:
+        if len(row) < 5:
+            continue
+        cwe_id = row[1].strip()
+        if not cwe_id.isdigit():
+            continue
+        severity = _parse_severity(row[3])
+        policy[f"CWE-{cwe_id}"] = CwePolicy(
+            flaw_category=row[0].strip(),
+            severity=severity,
+            static=_flag(row[4]),
+            dynamic=_flag(row[5]) if len(row) > 5 else False,
+        )
+    return policy
+
+
+def resolve_severity(
+    policy: Mapping[str, CwePolicy],
+    cwe: str,
+    target: object = None,
+    ranking: object = None,
+) -> int:
+    """Resolve a finding's severity exclusively from policy, keyed on its CWE.
+
+    Policy always wins; any legacy rule-local severity string is discarded. An
+    unmapped or non-static CWE resolves to 0 (report-only, not scored).
+    """
+    pol = policy.get(cwe)
+    if pol is None or not pol.static:
+        return 0
+    return pol.severity
+
+
+def assert_rules_resolve(rules: Iterable[object], policy: Mapping[str, CwePolicy]) -> None:
+    """Fail loud if any enabled rule's CWE is unmapped in the policy.
+
+    Rules expose ``cwe`` and (optionally) ``status``; only ``enabled`` rules are
+    checked. Raises :class:`PolicyError` before any scan work proceeds.
+    """
+    unmapped: list[str] = []
+    for rule in rules:
+        if getattr(rule, "status", "enabled") != "enabled":
+            continue
+        cwe = getattr(rule, "cwe", None)
+        if not isinstance(cwe, str) or cwe not in policy:
+            rule_id = getattr(rule, "rule_id", "<unknown>")
+            unmapped.append(f"{rule_id} -> {cwe}")
+    if unmapped:
+        raise PolicyError("enabled rules reference CWEs absent from the policy: " + ", ".join(sorted(unmapped)))
+
+
+def _parse_severity(value: str) -> int:
+    try:
+        severity = int(value.strip())
+    except ValueError:
+        return 0
+    return min(5, max(0, severity))
+
+
+def _flag(value: str) -> bool:
+    return value.strip().upper() == "X"
diff --git a/src/openultrasast/reports.py b/src/openultrasast/reports.py
index 649f367..c5e8f30 100644
--- a/src/openultrasast/reports.py
+++ b/src/openultrasast/reports.py
@@ -71,10 +71,11 @@ def write_manifest(
     verifications: list[VerificationResult],
     artifact_paths: dict[str, Path],
     path: Path,
+    score: dict[str, object] | None = None,
 ) -> None:
     path.parent.mkdir(parents=True, exist_ok=True)
     verification_by_id = _verification_by_id(verifications)
-    payload = {
+    payload: dict[str, object] = {
         "scan_id": run.scan_id,
         "target": str(run.target),
         "artifacts": {name: _relative_artifact(run.root, artifact) for name, artifact in sorted(artifact_paths.items())},
@@ -93,6 +94,8 @@ def write_manifest(
             for finding in findings
         ],
     }
+    if score is not None:
+        payload["score"] = score
     path.write_text(json.dumps(payload, indent=2, sort_keys=True) + "\n")
 
 
diff --git a/src/openultrasast/scoring/__init__.py b/src/openultrasast/scoring/__init__.py
new file mode 100644
index 0000000..2e5bd89
--- /dev/null
+++ b/src/openultrasast/scoring/__init__.py
@@ -0,0 +1,21 @@
+"""Policy-weighted project scoring (verycode-style AppSec score)."""
+
+from .project_score import (
+    REACH_MULT,
+    SEV_WEIGHT,
+    ScoreArtifact,
+    build_score_artifact,
+    finding_penalty,
+    gate,
+    project_score,
+)
+
+__all__ = [
+    "REACH_MULT",
+    "SEV_WEIGHT",
+    "ScoreArtifact",
+    "build_score_artifact",
+    "finding_penalty",
+    "gate",
+    "project_score",
+]
diff --git a/src/openultrasast/scoring/project_score.py b/src/openultrasast/scoring/project_score.py
new file mode 100644
index 0000000..e07d13c
--- /dev/null
+++ b/src/openultrasast/scoring/project_score.py
@@ -0,0 +1,138 @@
+from __future__ import annotations
+
+import math
+from collections.abc import Mapping
+from dataclasses import asdict, dataclass
+
+from ..findings import StaticFinding
+from ..policy import CwePolicy
+
+# Penalty weight per policy severity (0-5). Higher severity costs the score more.
+SEV_WEIGHT = {5: 50, 4: 25, 3: 10, 2: 2, 1: 1, 0: 0}
+
+# Reachability multiplier — the false-positive calibration knob. A confirmed FP
+# lowers a finding's effective reachability rather than deleting the rule.
+REACH_MULT = {"reachable": 1.0, "inferred-file-surface": 0.6, "unknown": 0.4}
+
+
+@dataclass(frozen=True)
+class ScoreArtifact:
+    project_score: int
+    max_severity: int
+    penalty_total: float
+    by_category: dict[str, int]
+    out_of_scope_dynamic_only: int
+    unmapped_cwe: list[str]
+    gate: dict[str, object]
+
+    def to_dict(self) -> dict[str, object]:
+        return asdict(self)
+
+
+def finding_penalty(finding: StaticFinding, rule_cwe: str | None, policy: Mapping[str, CwePolicy]) -> float:
+    """Penalty contributed by one finding: severity weight × reachability multiplier.
+
+    Dynamic-only or unmapped CWEs contribute zero (report-only, never scored).
+    """
+    pol = policy.get(rule_cwe) if rule_cwe else None
+    if pol is None or not pol.static:
+        return 0.0
+    return SEV_WEIGHT[pol.severity] * REACH_MULT.get(finding.reachability_status, REACH_MULT["unknown"])
+
+
+def project_score(
+    findings: list[StaticFinding],
+    rule_cwe_by_id: Mapping[str, str],
+    policy: Mapping[str, CwePolicy],
+    k: float = 60.0,
+) -> int:
+    """Compute the 0-100 project score (shadow findings excluded by the caller).
+
+    Exponential decay of total penalty: no penalty → 100; one severity-5 reachable
+    finding → ~43.
+    """
+    total = sum(finding_penalty(finding, rule_cwe_by_id.get(finding.finding_id), policy) for finding in findings)
+    return round(100 * math.exp(-total / k))
+
+
+def gate(
+    findings: list[StaticFinding],
+    score: int,
+    rule_cwe_by_id: Mapping[str, str],
+    policy: Mapping[str, CwePolicy],
+    *,
+    min_score: int,
+    block_severity_reachable: int = 5,
+    blocking: bool,
+) -> dict[str, object]:
+    """Two-condition gate verdict.
+
+    A finding at ``block_severity_reachable`` severity that is ``reachable`` always
+    fails. The score threshold fails only when ``blocking`` is enabled.
+    """
+    hard_fail = any(
+        _severity(rule_cwe_by_id.get(finding.finding_id), policy) >= block_severity_reachable and finding.reachability_status == "reachable"
+        for finding in findings
+    )
+    score_fail = blocking and score < min_score
+    return {
+        "min_score": min_score,
+        "block_severity_reachable": block_severity_reachable,
+        "blocking": blocking,
+        "passed": not hard_fail and not score_fail,
+    }
+
+
+def build_score_artifact(
+    findings: list[StaticFinding],
+    rule_cwe_by_id: Mapping[str, str],
+    policy: Mapping[str, CwePolicy],
+    *,
+    k: float = 60.0,
+    min_score: int = 80,
+    block_severity_reachable: int = 5,
+    blocking: bool = False,
+) -> ScoreArtifact:
+    score = project_score(findings, rule_cwe_by_id, policy, k=k)
+    penalty_total = 0.0
+    max_severity = 0
+    by_category: dict[str, int] = {}
+    out_of_scope_dynamic_only = 0
+    unmapped: set[str] = set()
+    for finding in findings:
+        cwe = rule_cwe_by_id.get(finding.finding_id)
+        pol = policy.get(cwe) if cwe else None
+        if pol is None:
+            unmapped.add(cwe or "unknown")
+            continue
+        if not pol.static:
+            if pol.dynamic:
+                out_of_scope_dynamic_only += 1
+            continue
+        penalty_total += finding_penalty(finding, cwe, policy)
+        max_severity = max(max_severity, pol.severity)
+        by_category[pol.flaw_category] = by_category.get(pol.flaw_category, 0) + 1
+    return ScoreArtifact(
+        project_score=score,
+        max_severity=max_severity,
+        penalty_total=round(penalty_total, 2),
+        by_category=dict(sorted(by_category.items())),
+        out_of_scope_dynamic_only=out_of_scope_dynamic_only,
+        unmapped_cwe=sorted(unmapped),
+        gate=gate(
+            findings,
+            score,
+            rule_cwe_by_id,
+            policy,
+            min_score=min_score,
+            block_severity_reachable=block_severity_reachable,
+            blocking=blocking,
+        ),
+    )
+
+
+def _severity(cwe: str | None, policy: Mapping[str, CwePolicy]) -> int:
+    pol = policy.get(cwe) if cwe else None
+    if pol is None or not pol.static:
+        return 0
+    return pol.severity
diff --git a/tests/test_policy.py b/tests/test_policy.py
new file mode 100644
index 0000000..9415226
--- /dev/null
+++ b/tests/test_policy.py
@@ -0,0 +1,47 @@
+from types import SimpleNamespace
+
+import pytest
+
+from openultrasast.findings import PATTERN_RULES
+from openultrasast.policy import (
+    CwePolicy,
+    PolicyError,
+    assert_rules_resolve,
+    load_policy,
+    resolve_severity,
+)
+
+
+def test_load_policy_parses_severity_and_scope() -> None:
+    policy = load_policy()
+
+    assert policy["CWE-121"] == CwePolicy("Buffer Overflow", 5, True, False)
+    assert policy["CWE-89"].severity == 4
+    assert policy["CWE-78"].static is True
+    assert len(policy) > 150  # ~167 CWEs vendored from verycode-policies
+
+
+def test_resolve_severity_is_policy_governed_and_identical_for_same_cwe() -> None:
+    policy = load_policy()
+
+    # Two different rules that map to the same CWE must get the same severity.
+    assert resolve_severity(policy, "CWE-78") == resolve_severity(policy, "CWE-78") == 5
+    # Unmapped CWE resolves to 0 (report-only, never scored).
+    assert resolve_severity(policy, "CWE-99999") == 0
+
+
+def test_builtin_rules_all_resolve_in_policy() -> None:
+    # The fail-loud invariant must pass for the shipped ruleset (CWE-120 remapped to CWE-121).
+    assert_rules_resolve(PATTERN_RULES, load_policy())
+
+
+def test_assert_rules_resolve_fails_loud_on_unmapped_enabled_rule() -> None:
+    policy = load_policy()
+    bad_enabled = SimpleNamespace(rule_id="bad", cwe="CWE-99999", status="enabled")
+    bad_disabled = SimpleNamespace(rule_id="bad-off", cwe="CWE-99999", status="disabled")
+
+    with pytest.raises(PolicyError, match="bad"):
+        assert_rules_resolve([bad_enabled], policy)
+
+    # A disabled rule with an unmapped CWE does not abort the scan.
+    assert_rules_resolve([bad_disabled], policy)
diff --git a/tests/test_score_pipeline.py b/tests/test_score_pipeline.py
new file mode 100644
index 0000000..6e2afaf
--- /dev/null
+++ b/tests/test_score_pipeline.py
@@ -0,0 +1,41 @@
+"""Phase 1 in-pipeline wiring: project score artifact + fail-loud CWE invariant."""
+
+import json
+from pathlib import Path
+from types import SimpleNamespace
+
+import pytest
+
+from openultrasast import cli
+from openultrasast.cli import main
+from openultrasast.policy import PolicyError
+
+
+def test_scan_writes_score_artifact_and_manifest_block(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    repo = tmp_path / "repo"
+    repo.mkdir()
+    (repo / "app.py").write_text("@app.route('/x')\ndef view():\n    return eval(request.data)\n")
+    monkeypatch.setenv("OPENULTRASAST_RUNS_DIR", ".runs")
+
+    assert main(["scan", str(repo), "--mode", "quick"]) == 0
+
+    run_dir = sorted((repo / ".runs").iterdir())[-1]
+    score = json.loads((run_dir / "score.json").read_text())
+    manifest = json.loads((run_dir / "manifest.json").read_text())
+
+    assert isinstance(score["project_score"], int) and 0 <= score["project_score"] <= 100
+    assert set(score["gate"]) == {"min_score", "block_severity_reachable", "blocking", "passed"}
+    assert manifest["score"] == score
+    assert manifest["artifacts"]["score"] == "score.json"
+
+
+def test_scan_fails_loud_when_an_enabled_rule_cwe_is_unmapped(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    repo = tmp_path / "repo"
+    repo.mkdir()
+    (repo / "app.py").write_text("x = 1\n")
+    monkeypatch.setenv("OPENULTRASAST_RUNS_DIR", ".runs")
+    unmapped = SimpleNamespace(rule_id="bogus", cwe="CWE-99999", status="enabled")
+    monkeypatch.setattr(cli, "PATTERN_RULES", (*cli.PATTERN_RULES, unmapped))
+
+    with pytest.raises(PolicyError):
+        main(["scan", str(repo), "--mode", "quick"])
diff --git a/tests/test_scoring.py b/tests/test_scoring.py
new file mode 100644
index 0000000..5aa4c3c
--- /dev/null
+++ b/tests/test_scoring.py
@@ -0,0 +1,73 @@
+from openultrasast.findings import StaticFinding
+from openultrasast.policy import CwePolicy
+from openultrasast.scoring import build_score_artifact, gate, project_score
+
+POLICY = {
+    "CWE-78": CwePolicy("Command Injection", 5, True, False),
+    "CWE-89": CwePolicy("SQL Injection", 4, True, False),
+    "CWE-999": CwePolicy("DAST Only", 5, False, True),  # dynamic-only -> report, never scored
+}
+
+
+def _finding(finding_id: str, reachability: str) -> StaticFinding:
+    return StaticFinding(
+        finding_id=finding_id,
+        path="a.py",
+        title="t",
+        severity="high",
+        confidence="medium",
+        evidence_level="static_corroboration",
+        rationale="r",
+        line=1,
+        function_name=None,
+        reachability_status=reachability,
+        reachability_evidence=[],
+        reachability_conditions=[],
+        tags=[],
+        ranking_priority=1.0,
+    )
+
+
+def test_empty_corpus_scores_100() -> None:
+    assert project_score([], {}, POLICY) == 100
+
+
+def test_single_severity5_reachable_scores_about_43() -> None:
+    finding = _finding("cmd:a.py:1", "reachable")
+    score = project_score([finding], {"cmd:a.py:1": "CWE-78"}, POLICY)
+    assert score == 43
+
+
+def test_dynamic_only_and_unmapped_contribute_zero_penalty() -> None:
+    dynamic = _finding("dyn:a.py:1", "reachable")
+    unmapped = _finding("ump:a.py:2", "reachable")
+    rule_cwe = {"dyn:a.py:1": "CWE-999", "ump:a.py:2": "CWE-12345"}
+
+    artifact = build_score_artifact([dynamic, unmapped], rule_cwe, POLICY)
+
+    assert artifact.project_score == 100  # neither contributes penalty
+    assert artifact.out_of_scope_dynamic_only == 1
+    assert artifact.unmapped_cwe == ["CWE-12345"]
+
+
+def test_hard_gate_fails_on_severity5_reachable_only() -> None:
+    reachable = _finding("cmd:a.py:1", "reachable")
+    inferred = _finding("cmd:a.py:2", "inferred-file-surface")
+    rule_cwe = {"cmd:a.py:1": "CWE-78", "cmd:a.py:2": "CWE-78"}
+
+    fail = gate([reachable], 90, rule_cwe, POLICY, min_score=80, blocking=False)
+    ok = gate([inferred], 90, rule_cwe, POLICY, min_score=80, blocking=False)
+
+    assert fail["passed"] is False  # severity-5 + reachable always fails
+    assert ok["passed"] is True  # inferred reachability does not trip the hard gate
+
+
+def test_score_gate_blocks_only_when_blocking_enabled() -> None:
+    finding = _finding("sql:a.py:1", "inferred-file-surface")
+    rule_cwe = {"sql:a.py:1": "CWE-89"}
+
+    advisory = build_score_artifact([finding], rule_cwe, POLICY, min_score=99, blocking=False)
+    blocking = build_score_artifact([finding], rule_cwe, POLICY, min_score=99, blocking=True)
+
+    assert advisory.gate["passed"] is True  # advisory-first: low score does not block
+    assert blocking.gate["passed"] is False  # blocking: score below min_score fails