chore: add changeset for Mistral Vibe support and validator/completion fixes

[TabishB]

Summary

Adds dedicated release tracking (a minor changeset) for user-facing changes merged to main since v1.3.1 that weren't yet covered by an existing changeset.

Changes in this release

New Features

• Mistral Vibe support ([codex] Add Mistral Vibe support with CI fix #1144) — New skills-only AI tool initialized via .vibe/skills/

Bug Fixes

• Case-insensitive requirement headers (fix: make requirement header parsing case-insensitive #1031) — Requirement headers parse regardless of capitalization
• Zsh completions on oh-my-zsh ([codex] fix Oh My Zsh completion compinit setup #1033) — Fixed completion install under oh-my-zsh's compinit

Other

• Clearer validation hints (fix(validator): hint when SHALL/MUST appears only in requirement header #1135) — openspec validate now guides authors to move SHALL/MUST onto the requirement body line when it only appears in the header

Notes

• Bump type is minor due to the new Mistral Vibe tool integration.
• Already-tracked changes (Kimi CLI, sync-in-core, workspace canonical paths) keep their existing changesets and are not duplicated here.
• Docs-only, test-only, and in-progress workspace/context-store beta commits are intentionally excluded per the changeset guidelines.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added support for "Mistral Vibe" as a skills-only tool via the .vibe/skills/ directory.

• Bug Fixes

  • Fixed spec parsing to handle requirement headers case-insensitively.
  • Resolved Zsh completion installation issues with oh-my-zsh.

• Improvements

  • Enhanced validation output with targeted hints for keyword placement in requirements.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 96fd1a22-06fe-4fcf-9b0b-d6109696f630

📥 Commits

Reviewing files that changed from the base of the PR and between 055957f and 2d65834.

📒 Files selected for processing (1)

• .changeset/mistral-vibe-and-fixes.md

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📝 Walkthrough

Walkthrough

A changeset metadata update for @fission-ai/openspec documenting a minor release that adds Mistral Vibe tool support, fixes requirement header case sensitivity, resolves Zsh/oh-my-zsh completion installation behavior, and improves openspec validate output hints.

Changes

Changeset Update

Layer / File(s)	Summary
Changeset metadata .changeset/mistral-vibe-and-fixes.md	Changelog entry documents four additions: Mistral Vibe skills-only tool via .vibe/skills/, case-insensitive requirement header parsing, Zsh completion fix for oh-my-zsh, and improved openspec validate hints for SHALL/MUST keyword placement.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Fission-AI/OpenSpec#1144: Implements Mistral Vibe tool support with .vibe/skills/ directory handling, directly corresponding to this changeset's Mistral Vibe feature.
• Fission-AI/OpenSpec#388: Previous Zsh/oh-my-zsh completion setup changes, related to the completion fix documented in this changeset.
• Fission-AI/OpenSpec#995: Adjusts spec parsing for requirement section detection, related to the case-insensitive header fix in this changeset.

Suggested reviewers

• alfred-openspec

Poem

🐰 Mistral whispers vibe and grace,
Case-insensitive parsing in place,
Zsh completion hops just right,
Validation hints burning bright! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: adding a changeset that documents Mistral Vibe support and fixes to the validator and completion functionality.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch changeset-mistral-vibe-and-fixes

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[alfred-openspec]

Looks good. Single release-tracking changeset, bump type matches the new Mistral Vibe support, and CI is green.