chore(governance): sync holdout tracking metrics in QUALITY_GATES

Update Holdout Tracking paragraph to 101/14/35 fixture minimums and
add anti-drift test so stale 100-phrase wording cannot regress.

Author: johnteee

reflective-prompt-library/plans/QUALITY_GATES_SUMMARY.md

@@ -304,7 +304,7 @@ The latest router improvement uses concept-level boundary rules for these cases
 
 ### Holdout Tracking
 
-ROUTE-002 measures unseen phrasing separately from ROUTE-001. Round 7 (2026-06-25) added Traditional Chinese holdout groups with matching router intent keywords — fairness test without full `SKILL.md` translation. Round 65 expanded to 36 groups / 100 phrases; post-panel maintenance added ROUTING_CONTRACT **R11** (approved-spec delivery) with ROUTE-003 `implement_not_plan_trap` at 100%. Treat this as a seeded holdout, not proof of broad semantic routing; add fresh cases before further router tuning.
+ROUTE-002 measures unseen phrasing separately from ROUTE-001. Round 7 (2026-06-25) added Traditional Chinese holdout groups with matching router intent keywords — fairness test without full `SKILL.md` translation. Round 65 expanded to 36 holdout groups; post-Round 68 maintenance added ROUTING_CONTRACT **R11** boundaries (101 ROUTE-002 phrases, 14 ROUTE-003 adversarial groups / 35 phrases including `implement_not_plan_trap`, `approved_spec_plan_not_implement_trap`, and `dispatch_meta_skill_trap`) at 100%. Treat this as a seeded holdout, not proof of broad semantic routing; add fresh cases before further router tuning.
 
 ## Phase 2 Status (post-Round 68 maintenance)
 

reflective-prompt-library/plans/tests/test_quality_gates_summary.py

@@ -86,6 +86,21 @@ def test_ci_paraphrase_totals_match_route_minimums(summary_text: str):
     )
     assert expected_total in summary_text
 
+
+def test_holdout_tracking_paragraph_matches_fixture_minimums(summary_text: str):
+    section = _section_between(
+        summary_text, "### Holdout Tracking", "## Phase 2 Status (post-Round 68 maintenance)"
+    )
+    assert f"{ROUTE_002_MIN_PHRASES} ROUTE-002 phrases" in section
+    assert (
+        f"{ROUTE_003_MIN_ADVERSARIAL_GROUPS} ROUTE-003 adversarial groups / "
+        f"{ROUTE_003_MIN_PHRASES} phrases"
+    ) in section
+    assert "approved_spec_plan_not_implement_trap" in section
+    assert "dispatch_meta_skill_trap" in section
+    assert "100 phrases" not in section
+
+
 def test_route_fixture_gate_mentions_cheatsheet_parity_tests(summary_text: str):
     section = _section_between(
         summary_text,