Add Grok support to AI Vault

[nwparker]

Summary

• Add Grok to AI Vault supported agents and resume command generation
• Scan Grok session summaries and hydrate title, cwd, branch, model, timestamps, message counts, and previews
• Localize an existing Source Control AI validation message required by lint

Verification

• pnpm exec vitest run --config config/vitest.config.ts src/main/ai-vault/session-scanner.test.ts
• pnpm run lint
• pnpm run typecheck

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR adds Grok as a supported AI Vault agent and improves error messaging. The Grok integration defines the agent type in shared types, implements a dedicated session file parser that extracts metadata and streams chat history from JSONL, integrates discovery and parsing into the main session scanner, and includes end-to-end tests. A secondary change replaces a hardcoded error message with localized strings when custom AI commands are empty, adding translations across five languages.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is largely incomplete against the repository's template. It lacks Screenshots section, detailed Testing checklist, AI Review Report with cross-platform compatibility verification, Security Audit summary, and Notes section—only providing a minimal Summary and Verification steps.	Expand the description to include Screenshots, comprehensive Testing checklist with build/lint/typecheck status, AI Review Report confirming cross-platform compatibility (macOS/Linux/Windows), Security Audit for path/command handling, and Notes on platform-specific behavior.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add Grok support to AI Vault' is concise, clear, and accurately describes the primary change—extending AI Vault to support the Grok agent with session scanning and resume functionality.
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 docstrings

• Create stacked PR
• Commit on current branch

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