chore(p0): drop never-enabled hunter tools, test-only functions and receiver delivery

Off every active line (PATHFINDER-2026-10-13/03-unified-proposal.md, cuts).
Deleted: the four hunter tools no caller enables (read_definition,
entry_points, flows, obligations) with their schemas and dispatch, the dead
mapping branch of find_refs; 20 functions whose only caller was one test
(mapping task records, compute_ranking_metrics, build_quick_hunter_prompt,
validate_evidence_transition, should_fuse, harness processors,
rank_targets_with_model, model/report slice rendering, taxonomy
hierarchical/related, config_value.verdict, taint.verdict, roles.load_roles,
features.language_of and build_for_scan, folds.leave_one_*,
features.recorded_case, search BatchExecutor and the three __main__ shims,
delivery.put_input); the receiver delivery mode of the plane. push_inputs.py
moved to benchmarks/push. memory.purge stays: the live-S3 test cleanup uses
it. Net: 2,730 lines deleted, 207 added. 473 targeted tests passed; 3,282
tests collect. breadth.toml records the removals.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/openultrasast/fusion.py

@@ -91,10 +91,6 @@ def fusion_triggers(
     return sorted(triggers)
 
 
-def should_fuse(finding: StaticFinding, verification: VerificationResult | None = None, *, high_assurance: bool = False) -> bool:
-    return bool(fusion_triggers(finding, verification, high_assurance=high_assurance))
-
-
 def _panel_a(finding: StaticFinding, verification: VerificationResult | None) -> PanelVerdict:
     """Vulnerability-leaning panel: steel-mans the vulnerability case."""
     reachable = finding.reachability_status == "reachable"
@@ -213,5 +209,4 @@ __all__ = [
     "fuse_finding",
     "fuse_findings",
     "fusion_triggers",
-    "should_fuse",
-]
+    ]