test(#3339): fold the state/phase/dispatch & model-profile issue-* cluster — Wave 7

Folds 9 legacy issue-*.test.cjs regression files (140 test() blocks) into
their module's main suite, per H3 (#3315) of the test-hygiene epic (#3053).
LAST of 4 issue-* waves — closes out the 74-file fix-*/issue-* backlog
(pending BUG_FILE_RE extension, held for a follow-up commit until Wave 6
is confirmed merged, per the epic's own zero-backlog precondition).

- issue-2828-flat-roadmap-total-phases.test.cjs (1) + issue-3204-state-
  writer-phase-count.test.cjs (21): both target state-document.cjs
  buildStateFrontmatter via different CLI entrypoints — merged jointly
  into state-document.test.cjs, 0 dropped.
- issue-2945-phase-complete-checkbox-rollback.test.cjs (4) + issue-2949-
  phase-complete-stage3-sentinel.test.cjs (4): both target phase.cts
  cmdPhaseComplete; issue explicitly warned of overlap — verified
  disjoint fixtures/assertions, 0 dropped, merged into phase.test.cjs.
- issue-2927-reviewer-lane-overlay-invocation.test.cjs (10) merged into
  review-lane-descriptor.test.cjs.
- issue-2939-dispatch-flatten-maxdepth.test.cjs (9) merged into
  host-integration.test.cjs, 2 dropped as verified exact duplicates.
- issue-2977-frontmatter-bom.test.cjs (5) merged into frontmatter.test.cjs.
- issue-2045-third-party-skills-surface.test.cjs (6) merged into
  capability-loader.test.cjs.
- issue-2517-runtime-aware-profiles.test.cjs (80, the largest single
  fold in the epic) merged into model-resolver.test.cjs, 1 dropped as a
  verified true duplicate (checked against src/model-resolver.cts logic,
  not just title similarity).

Fixed a genuine eslint irregular-whitespace finding: a literal BOM
character embedded in a doc comment (pre-existing content from the
original #2977 source, illustrating what a BOM looks like) — replaced
with a readable U+FEFF notation.

3 stale doc references found and fixed (docs/adr/2313, 3180, 443).

Zero net test-coverage loss. No production code changed.

docs/adr/2313-codex-passive-model-posture.md

@@ -191,8 +191,9 @@ ADR-2719 §7 deliberately keeps and `npm run gen:install-tree` regenerates.
 exist in the tree. ADR-1239's Codex-binding section still names the retired fixture; it is recorded
 here so a Phase-1 implementer does not go looking for a gate that was removed a release ago.
 
-`tests/codex-config.test.cjs` and `tests/issue-2517-runtime-aware-profiles.test.cjs` assert the
-embedding today and flip to assert omission in the same phase.
+`tests/codex-config.test.cjs` and `tests/model-resolver.test.cjs` (folds former
+`issue-2517-runtime-aware-profiles`) assert the embedding today and flip to assert omission in the
+same phase.
 
 ## Alternatives considered