feat(pre-push-safety-net): render bounded reports and preserve full evidence

.kiro/specs/pre-push-safety-net/implementation-group-4.md

@@ -4,9 +4,10 @@ Date: 2026-09-13. The maintainer authorized group 4 as a whole. Scope is tasks
 4.1–4.3: targeted novelty comparison, actionability admission and compact reporting.
 Groups 1–3 are verified at `6ba2b06`; full transaction replay remains task 5.1.
 
-Status: implementation in progress. Task completion requires independent review
-and fresh evidence. No production capability is enabled for normal hook alerts;
-capability admission still requires task 8.3 evaluation.
+Status: tasks 4.1–4.3 are VERIFIED (TASK scope), bringing the spec to 14/27 tasks.
+Tasks 4.1 and 4.2 passed independent review. Task 4.3 used the Kiro manual review
+fallback after the agent service rejected further dispatch. No production capability
+is enabled for normal hook alerts; actual admission still requires task 8.3 evaluation.
 
 ## Verification boundary
 
@@ -62,3 +63,64 @@ default registry. Explicitly synthetic PHP/WordPress and JavaScript/Express cont
 receive equivalent admission and enforcement behavior. They do not qualify any
 real capability; task 8.3 still owns actual eligibility. Task 4.2 brings progress to
 13/27 tasks. Compact reporting remains in this authorized group.
+
+## Task 4.3 verification
+
+The agent service rejected the task 4.3 dispatch with `agent thread limit reached`.
+The [kiro-impl skill](../../../.opencode/skills/kiro-impl/SKILL.md) explicitly provides:
+“If multi-agent is not available, fall back to manual mode execution for all tasks.”
+Implementation, review and completion checks therefore ran in the main context.
+This is a manual review record, not an independent-review claim.
+
+OFF controls produced seven relevant failures; ON and unflagged reporting tests
+passed. Manual review found and repaired an invalid artifact path escaping the
+notice path and a complete comparison carrying failed base evidence. A writer
+exiting zero without a receipt is rejected. Stalled-writer tests prove cancellation,
+preservation of an existing artifact and no surviving child. Other controls cover
+all candidate/scan preservation, five defects with only three displayed, separate
+coverage/enforcement, escaping and bounded long text, and immutable provenance.
+
+## Review Verdict
+- VERDICT: APPROVED
+- TASK: 4.3
+- REVIEW_MODE: Kiro manual fallback; agent dispatch unavailable.
+- MECHANICAL_RESULTS: final full suite 1,222 passed, nine skipped in 102.39 seconds;
+  Ruff and format (238 files), mypy (111 source files), compileall, diff checks and
+  detection/map/pair gates PASS. No new placeholders or hardcoded secrets.
+- FINDINGS: Invalid destination and failed-base completeness issues repaired and
+  verified with failing controls followed by passing tests. No outstanding task finding.
+- BOUNDARY: Reporting consumes existing admission and engine records; no new
+  detector, ranker, graph mutation, provider or installed hook.
+
+The image build and CLI boot passed. The packaged integration control rechecked
+captured actual PHP/JavaScript answers through current comparison/admission/reporting,
+preserving complete scan payloads and default diagnostic-only output. Five explicitly
+synthetic admitted defects retain all five records, display three summaries and keep
+the block decision. Artifact write failure also retains that decision. Packaged
+policy/reporter hashes match the workspace. See
+`benchmarks/measurements/2026-09-13-compact-report-smoke.json`.
+
+Publication is atomic from mode-0600 temporary files. A separate Linux process
+bounds serialization and filesystem work by the remaining transaction/report
+allowance. Hard cancellation can leave a private unpublished partial file; it is
+never presented as the completed artifact. Caller-supplied stage timings are
+preserved, and the delivery receipt measures publication/rendering separately.
+Observed packaged delivery costs (about 0.02–0.04 seconds for these controls) do not
+establish whole-hook latency.
+
+## Group integration validation
+
+- DECISION: GO
+- VALIDATION_SCOPE: Tasks 4.1–4.3 only; no full-feature or release admission.
+- CROSS_TASK_CONTRACTS: Actual captured engine evidence → bound delta → empty-registry
+  diagnostics → compact report and complete artifact PASS. Explicitly synthetic
+  calibrated controls → admission → advisory/blocking → capped rendering PASS.
+- REQUIREMENTS: Group-owned portions of 2.4, 3.1–3.5, 4.1, 5.1–5.5, 7.3 and 8.1 are
+  covered by the implementation and controls above. Full transaction wiring and
+  representative capability/latency evaluation remain later tasks.
+- DESIGN_ALIGNMENT: Existing arbiters and ranker retained; policy and report live
+  in their planned push-adapter boundary. No orphaned module or upstream detector change.
+- BLOCKED_TASKS: None in group 4. Automatic dominance change-context projection is
+  a documented upstream integration limit, not erased by these declared controls.
+- NEXT: Group 5 full replay and first bounded experiment. Complete that experiment
+  before persistent graph reuse in group 6. Groups 5–8 remain pending.