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_push_inputs.py

@@ -6,7 +6,7 @@ import subprocess
 
 import pytest
 
-from openultrasast.push_inputs import validate_manifest
+from benchmarks.push.push_inputs import validate_manifest
 
 
 def git(root, *args):
@@ -118,7 +118,7 @@ def test_authored_edit_requires_exact_original_and_provenance(manifest):
 
 @pytest.mark.parametrize("field", ["snapshots", "cases"])
 def test_empty_population_rejected(manifest, field):
-    from openultrasast.push_inputs import InputError
+    from benchmarks.push.push_inputs import InputError
 
     data, _, run = manifest
     data[field] = []
@@ -127,7 +127,7 @@ def test_empty_population_rejected(manifest, field):
 
 
 def test_missing_snapshot_identity_rejected(manifest):
-    from openultrasast.push_inputs import InputError
+    from benchmarks.push.push_inputs import InputError
 
     data, _, run = manifest
     del data["snapshots"][0]["id"]