Merge remote-tracking branch 'origin/main' into garrytan/plan-tune-skill

Conflicts resolved:
- VERSION / package.json: keep 1.0.0.0 (our v1 milestone bump from
  commit 18fc95c0, supersedes main's 0.18.4.0).
- CHANGELOG.md: preserved both entries in chronological order — v1.0.0.0
  (writing-style + throughput receipts) above v0.18.4.0 (codex + Apple
  Silicon hardening). No gaps in sequence: 1.0.0.0 → 0.19.0.0 → 0.18.4.0
  → 0.18.3.0 → ...

Main added v0.18.4.0 (#1056): codex + Apple Silicon hardening wave.

Regenerated all SKILL.md files after merge so they pick up both main's
template changes AND our v1 writing-style + question-tuning additions.

Full free test suite: 1288 pass, 0 fail, 113 skip across 37 files, 8555
expect() calls.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

test/helpers/touchfiles.ts

@@ -173,6 +173,7 @@ export const E2E_TOUCHFILES: Record<string, string[]> = {
 
   // Autoplan
   'autoplan-core':  ['autoplan/**', 'plan-ceo-review/**', 'plan-eng-review/**', 'plan-design-review/**'],
+  'autoplan-dual-voice': ['autoplan/**', 'codex/**', 'bin/gstack-codex-probe', 'scripts/resolvers/review.ts', 'scripts/resolvers/design.ts'],
 
   // Skill routing — journey-stage tests (depend on ALL skill descriptions)
   'journey-ideation':       ['*/SKILL.md.tmpl', 'SKILL.md.tmpl', 'scripts/gen-skill-docs.ts'],
@@ -321,6 +322,7 @@ export const E2E_TIERS: Record<string, 'gate' | 'periodic'> = {
 
   // Autoplan — periodic (not yet implemented)
   'autoplan-core': 'periodic',
+  'autoplan-dual-voice': 'periodic',
 
   // Skill routing — periodic (LLM routing is non-deterministic)
   'journey-ideation': 'periodic',