chore(gitignore): ignore generated CLAUDE.md + .mcp.json

[wcjord]

What

Add the sync-copilot-to-claude-generated files (.mcp.json, .mcp.json.generated_by_sync, and where missing CLAUDE.md) to .gitignore.

Why

Per pangeachat/.github#171, sync-copilot-to-claude.py fans out the canonical .github/.mcp.json into every sibling repo's root on every Claude Code SessionStart. The generated copies should be gitignored — same pattern as the existing CLAUDE.md ignore. For the synapse-module repos where CLAUDE.md was never gitignored, this PR also closes that older gap.

Single source of truth at .github/.mcp.json.

Testing

.gitignore-only. git check-ignore matches each pattern in this repo. No code or runtime surface, so no unit/integration/smoke buckets apply per doc/config-only exemption.

Deploy Notes

None.

Summary by CodeRabbit

• Chores
  • Updated version control configuration to exclude additional system and generated files from the repository.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9dfe2e84-e5bf-441b-acd8-ff74790d4474

📥 Commits

Reviewing files that changed from the base of the PR and between 0c328bb and e99cc1e.

📒 Files selected for processing (1)

• .gitignore

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📝 Walkthrough

Walkthrough

The pull request updates the repository's .gitignore configuration file to exclude macOS system artifacts and Claude/MCP-related generated outputs from version control, ensuring these temporary and platform-specific files do not clutter the repository.

Changes

Repository Ignore Configuration

Layer / File(s)	Summary
Ignore patterns for macOS and generated files .gitignore	Added .DS_Store entry for macOS system files and new rules for Claude/MCP-generated outputs (CLAUDE.md, .mcp.json, .mcp.json.generated_by_sync) with clarifying comments.

Estimated Code Review Effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A rabbit hops through the git, so clean,
No .DS_Store clutter in sight to be seen,
Claude's traces fade, MCP files too,
The repo stays tidy, all shiny and new! ✨

🚥 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 describes the main change: adding entries to .gitignore for generated CLAUDE.md and .mcp.json files, which matches the actual modifications to .gitignore.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/gitignore-mcp-json

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