v1.13.0.0 feat: add Claude outside-voice skill

[garrytan]

Summary

Adds /gstack-claude as the Claude outside-voice counterpart to /codex for non-Claude hosts. External hosts now get review, adversarial challenge, and read-only consult modes through claude -p without exposing nested Claude mutation tools.

Also fixes validation regressions found during the work: the gbrain config isolation test no longer depends on local machine config contents, the tracked-file-size check now warns instead of failing so large fixtures can remain in repo, and Claude review/challenge diff temp files now use mktemp instead of a $$ path.

Changes

• Add claude/SKILL.md.tmpl with review/challenge/consult modes, temp-file stdin prompt transport, auth checks, JSON output parsing, --disable-slash-commands, tool-less review/challenge, and read-only consult flags.
• Skip the Claude outside-voice skill only for the Claude host.
• Extend generated-doc tests so all external hosts emit gstack-claude/SKILL.md and Claude host omits claude/SKILL.md.
• Preserve real ~/.gstack/config.yaml contents in the GSTACK_HOME override test.
• Convert oversized tracked file validation into [size-warning] advisory output.
• Remove the restored Opus fanout overlay nudge and its hard-coded preflight/test requirement.
• Bump release metadata to 1.13.0.0 and update CHANGELOG.md.

Test Coverage

Full suite before release metadata:

• bun test — passed, exit 0

Targeted verification after release metadata:

• bun test test/ship-version-sync.test.ts test/gen-skill-docs.test.ts test/skill-validation.test.ts test/brain-sync.test.ts test/model-overlay-opus-4-7.test.ts — 742 pass, 0 fail

Follow-up verification after Claude outside-voice review fixes:

• bun run gen:skill-docs --host all
• bun test test/gen-skill-docs.test.ts — 371 pass, 0 fail
• bun test test/model-overlay-opus-4-7.test.ts test/gen-skill-docs.test.ts — 380 pass, 0 fail

Notes:

• The fixture browse/test/fixtures/security-bench-haiku-responses.json remains in git.
• The size check now logs [size-warning] tracked files over 2 MiB: browse/test/fixtures/security-bench-haiku-responses.json (27.5 MiB) instead of failing.
• .context/attachments/image.png is ignored Conductor attachment state and is not part of this PR.

Pre-Landing Review

/gstack-claude review was run in tool-less mode against this branch. The actionable finding was the diff temp-file collision risk; it is fixed by using mktemp for DIFF_FILE.

Documentation

CHANGELOG.md updated for 1.13.0.0.

Test plan

• Full bun test
• Focused generated-doc, validation, gbrain, Opus overlay, and version-sync tests
• /gstack-claude outside-voice review
• Branch pushed to origin/garrytan/claude-codex-skill

[github-actions]

E2E Evals: ✅ PASS

0/0 tests passed | $0 total cost | 12 parallel runners

Suite	Result	Status	Cost

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12x ubicloud-standard-2 (Docker: pre-baked toolchain + deps) | wall clock ≈ slowest suite