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/findings.py

@@ -99,17 +99,6 @@ def uncovered_languages(
     return sorted(counts.items())
 
 
-def build_quick_hunter_prompt(target: FileTarget, source_excerpt: str) -> str:
-    return (
-        "Review this file for security-relevant issues. Return structured findings only when evidence exists.\n"
-        f"Path: {target.path}\n"
-        f"Language: {target.language}\n"
-        f"Tags: {', '.join(target.tags) or 'none'}\n"
-        "Source excerpt:\n"
-        f"{source_excerpt[:4000]}"
-    )
-
-
 def write_findings(findings: list[StaticFinding], path: Path) -> None:
     path.parent.mkdir(parents=True, exist_ok=True)
     payload = {"findings": [asdict(finding) for finding in findings]}