fix(ci): run ruff format, and record run 5 at 90% pair-correct

CI was red on `ruff format --check`: 23 files. I ran `ruff check` after every
change this session and never once ran `ruff format --check`, though CI runs
both. Lint passing is not formatting passing, and I treated one as evidence for
the other for the whole session.

Formatting applied. The full CI sequence now reproduces locally: format, lint,
mypy over 94 files, 735 tests, three gates byte-identical, compileall, and the
semantic job's 16 marked tests.

Also records run 5 of the pipeline measurement, which the vampi fix lifted as
predicted:

                       hunter (K=5)   pipeline (K=1)
  pair-correct              76.7%          90.0%
  leak                      12.3%           6.7%
  detection                    --          96.7%
  cost                     ~$0.69        $0.0068

27 of 30 pairs. Five runs, each step from a measurement contradicting an
assumption: 73.3 (no pipeline path) -> 73.3 (routing fixed, IDENTICAL, which
exposed the discarded verdict) -> 80.0 (residual question matched to its
arbiter) -> 86.7 (aiohttp settings) -> 90.0 (dominance question no longer
contradicting its own evidence).

One miss left: dsvpwa-dsvpwa-main, whose setting is an argparse --ssl default
rather than a security-setting call. Out of reach before the settings work and
still is; contorting the arbiter around one pair would be worse than the miss.

The caveat is recorded beside the number: 30 pairs of one slice, and the slice
iterated against all session. The +16% overfitting gap against vfc-js is why
contributor-scan Req 8.1/8.2 exist.

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

tests/test_model_report.py

@@ -62,10 +62,21 @@ def test_every_finding_shows_its_rung() -> None:
     from openultrasast.model.report import render_findings
 
     finding = StaticFinding(
-        finding_id="r:app.py:1", path="app.py", title="t", severity="high", confidence="medium",
-        evidence_level="static_corroboration", rationale="why", line=1, function_name="run",
-        reachability_status="unknown", reachability_evidence=[], reachability_conditions=[], tags=[],
-        ranking_priority=1.0, rung=Rung.ENTAILED,
+        finding_id="r:app.py:1",
+        path="app.py",
+        title="t",
+        severity="high",
+        confidence="medium",
+        evidence_level="static_corroboration",
+        rationale="why",
+        line=1,
+        function_name="run",
+        reachability_status="unknown",
+        reachability_evidence=[],
+        reachability_conditions=[],
+        tags=[],
+        ranking_priority=1.0,
+        rung=Rung.ENTAILED,
     )
     text = render_findings([finding])
     assert "model_entailed" in text and "app.py" in text