feat: cross-model outside voice in plan reviews (v0.9.9.1) (#326)

* feat: add generateCodexPlanReview() resolver for cross-model plan review

New resolver offers an optional Codex (or Claude subagent fallback) "outside
voice" after plan review sections complete. Includes cross-model tension
detection with auto-TODO proposals, review log persistence, and an Outside
Voice row in the Review Readiness Dashboard.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat: integrate {{CODEX_PLAN_REVIEW}} into CEO and eng review templates

CEO review: insert after Section 11 + add Outside Voice summary row.
Eng review: replace hardcoded Step 0.5 with resolver (adds fallback,
logging, dashboard, xhigh reasoning, cross-model tension tracking).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: regenerate SKILL.md files from updated templates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: update project documentation for v0.9.9.1

ARCHITECTURE.md: added {{CODEX_PLAN_REVIEW}} to placeholder table.
CHANGELOG.md: added v0.9.9.1 entry for outside voice feature.
VERSION: bumped to 0.9.9.1.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: move {{CODEX_PLAN_REVIEW}} after review sections in eng review

Codex adversarial review caught that the placeholder was positioned
before the 4 review sections, so the "After all review sections are
complete" instruction could confuse the model. Moved it after Section
4's STOP directive where it belongs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: regenerate eng review SKILL.md files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.11.5.2] - 2026-03-22 — Outside Voice
+
+### Added
+
+- **Plan reviews now offer an independent second opinion.** After all review sections complete in `/plan-ceo-review` or `/plan-eng-review`, you can get a "brutally honest outside voice" from a different AI model (Codex CLI, or a fresh Claude subagent if Codex isn't installed). It reads your plan, finds what the review missed — logical gaps, unstated assumptions, feasibility risks — and presents findings verbatim. Optional, recommended, never blocks shipping.
+- **Cross-model tension detection.** When the outside voice disagrees with the review findings, the disagreements are surfaced automatically and offered as TODOs so nothing gets lost.
+- **Outside Voice in the Review Readiness Dashboard.** `/ship` now shows whether an outside voice ran on the plan, alongside the existing CEO/Eng/Design/Adversarial review rows.
+
+### Changed
+
+- **`/plan-eng-review` Codex integration upgraded.** The old hardcoded Step 0.5 is replaced with a richer resolver that adds Claude subagent fallback, review log persistence, dashboard visibility, and higher reasoning effort (`xhigh`).
+
 ## [0.11.5.1] - 2026-03-23 — Inline Office Hours
 
 ### Changed