feat(learning-harness): absence rows travel with their registration

Eight of the ten vendored access-control rows had no named handler at all,
so every one of them would have scored `missing_context` forever rather
than as a detector miss. After the re-harvest nine are named and the tenth
states its reason.

The handler-context mode now carries the class its framework registers,
multi-line decorators, and commented-out guards -- `#@token_required`
above a ThreatByte handler is the entire bug. Where the registration lives
in another document (connexion's `operationId`, an express router), a
recipe names `context = [...]`, the harvester writes that stanza per side,
and the pair materializes both files at their repository-relative paths so
the entry-point mapper sees the layout the project has. `harvest_recipe`
fetches every blob before the first write and the driver takes `--report`,
so a failed fetch leaves a reviewed excerpt exactly as it was.

Two defects the re-harvest exposed: `.mjs` was not a known suffix, so the
one pair vendored as an ES module had no file target at all; and
`_python_route_access` matched auth words inside decorator prose, reading
`@ns.doc(description='... without proper authorization checks')` as a
guard. Recorded in the hygiene artifact: nine of the ten duplicate groups
sit on both sides of the split, which the repository-level split cannot
see.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01T7XD7x5KonMdmGRkp63EQG

src/openultrasast/learning/rounds.py

@@ -125,7 +125,7 @@ def score_case(case: PairCase, scan: Scan, *, taxonomy: FamilyTaxonomy, runs: in
     A pair the corpus already marked unscorable is never run: spending model calls on a row that cannot
     be scored buys nothing and would put its noise into a floor it does not belong in.
     """
-    from ..pairs import _materialize, _overlay_scan
+    from ..pairs import _materialize_side, _overlay_scan
 
     name = family or _family_of(case, taxonomy)
     if case.unscorable:
@@ -138,8 +138,8 @@ def score_case(case: PairCase, scan: Scan, *, taxonomy: FamilyTaxonomy, runs: in
             unscorable_reason=case.unscorable,
         )
     with tempfile.TemporaryDirectory(prefix="ousast-round-") as scratch:
-        vuln_root = _materialize(Path(scratch) / "vuln", case.vuln_file, case.relpath)
-        fix_root = _materialize(Path(scratch) / "fixed", case.fixed_file, case.relpath)
+        vuln_root = _materialize_side(Path(scratch) / "vuln", case, side="vuln")
+        fix_root = _materialize_side(Path(scratch) / "fixed", case, side="fixed")
         ranges = _overlay_scan(vuln_root).ranges
         vuln_runs = [scan(vuln_root) for _ in range(max(runs, 1))]
         fix_runs = [scan(fix_root) for _ in range(max(runs, 1))]