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]>

tests/test_calibration.py

@@ -6,7 +6,6 @@ from openultrasast.calibration import (
     apply_ranking_calibration,
     calibrate_ranking,
     calibrate_rankings,
-    compute_ranking_metrics,
     learning_from_finding_outcome,
     record_false_positive_learning,
     write_false_positive_learnings,
@@ -62,34 +61,6 @@ def test_false_positive_learning_records_reason_and_scope(tmp_path: Path) -> Non
     assert "missing_attacker_control" in output.read_text()
 
 
-def test_ranking_metrics_track_false_positive_reasons_by_tier() -> None:
-    metrics = compute_ranking_metrics(
-        [
-            {"tier": "A", "outcome": FindingOutcome.VERIFIED, "time_to_verification_seconds": 10},
-            {
-                "tier": "A",
-                "outcome": FindingOutcome.REJECTED,
-                "reason": FalsePositiveReason.UNREACHABLE_PATH,
-                "time_to_verification_seconds": 20,
-            },
-            {"tier": "B", "outcome": FindingOutcome.REJECTED, "reason": FalsePositiveReason.DUPLICATE},
-            {
-                "tier": "A",
-                "outcome": FindingOutcome.UNVERIFIED,
-                "reason": FalsePositiveReason.UNVERIFIED,
-                "missed_fixture_vulnerabilities": 1,
-            },
-        ],
-        tier="A",
-    )
-
-    assert metrics.verified_findings == 1
-    assert metrics.false_positives == 2
-    assert metrics.time_to_verification_seconds == 15.0
-    assert metrics.missed_fixture_vulnerabilities == 1
-    assert metrics.false_positive_reasons["unreachable_path"] == 1
-
-
 def test_scoped_false_positive_demotion_does_not_suppress_class_globally() -> None:
     learning = record_false_positive_learning(
         _finding("auth/login.py"),