fix(#892): parse checklist-style roadmap phases in validate/verify (#908)

buildRoadmapPhaseVariants() only matched heading-style phases (## Phase N:),
silently skipping the supported checklist format (- [x] **Phase N: name**).
This caused W007 false-positives for every on-disk phase dir when the project
uses a checklist ROADMAP. Fix adds a second regex pass (mirroring the existing
buildNotStartedPhaseVariants() approach). Also refactors the duplicate
inline heading-only regex in cmdValidateConsistency() to delegate to
buildRoadmapPhaseVariants() (DRY). Regression test in
tests/bug-892-validate-checklist-roadmap-phases.test.cjs covers both paths.

Closes #892

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

scripts/lint-test-file-count.allowlist.json

@@ -131,6 +131,14 @@
         "install.test.cjs"
       ],
       "issue": "TBD"
+    },
+    "validate": {
+      "files": [
+        "bug-3129-validate-commit-git-bypass.test.cjs",
+        "bug-892-validate-checklist-roadmap-phases.test.cjs",
+        "validate-context.test.cjs"
+      ],
+      "issue": "892"
     }
   }
 }