feat: user sovereignty — AI models recommend, users decide (v0.13.2.0) (#603)

* feat: user sovereignty — AI models recommend, users decide

When Claude and Codex agree on a scope change, they now present it to the
user instead of auto-incorporating it. Adds User Sovereignty as the third
core principle in ETHOS.md. Fixes the cross-model tension template in
review.ts to present both perspectives neutrally instead of judging. Adds
User Challenge category to autoplan with proper contract updates (intro,
important rules, audit trail, gate handling). Adds Outside Voice Integration
Rule to CEO and eng review templates.

* chore: regenerate SKILL.md files from updated templates

* chore: bump version and changelog (v0.13.2.0)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: proper gstack description in openai.yaml + block Codex from rewriting it

Codex kept overwriting agents/openai.yaml with a browse-only description.
Two fixes: (1) better description covering full PM/dev/eng/CEO/QA scope,
(2) add agents/ to the filesystem boundary so Codex stops modifying it.

* chore: regenerate SKILL.md files with updated filesystem boundary

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

plan-eng-review/SKILL.md.tmpl

@@ -153,6 +153,14 @@ Evaluate:
 
 {{CODEX_PLAN_REVIEW}}
 
+### Outside Voice Integration Rule
+
+Outside voice findings are INFORMATIONAL until the user explicitly approves each one.
+Do NOT incorporate outside voice recommendations into the plan without presenting each
+finding via AskUserQuestion and getting explicit approval. This applies even when you
+agree with the outside voice. Cross-model consensus is a strong signal — present it as
+such — but the user makes the decision.
+
 ## CRITICAL RULE — How to ask questions
 Follow the AskUserQuestion format from the Preamble above. Additional rules for plan reviews:
 * **One issue = one AskUserQuestion call.** Never combine multiple issues into one question.