chore: remove obsolete Cerebro ignore entries

[johnnygreco]

📋 Summary

Remove obsolete Cerebro-specific ignore patterns now that Cerebro is no longer used in this repository. This keeps the ignore list aligned with active tooling and avoids carrying stale project conventions.

🔗 Related Issue

N/A

🔄 Changes

• Removed the Cerebro block from .gitignore.
• Deleted stale ignore entries for .cerebro/, .cursor/rules/cerebro.mdc, and .claude/rules/cerebro.md.
• Kept unrelated ignore rules, including .cursor/mcp.json, unchanged.

🧪 Testing

• make test passes (N/A — metadata-only .gitignore change)
• Unit tests added/updated (N/A — no testable runtime logic changed)
• E2E tests added/updated (if applicable) (N/A — no user-facing behavior changes)

✅ Checklist

• Follows commit message conventions
• Commits are signed off (DCO) (not included in this commit)
• Architecture docs updated (if applicable) (N/A)

[greptile-apps]

Greptile Summary

This PR removes four stale .gitignore entries (the # Cerebro knowledge base comment block and its three patterns) that were added for a tool no longer used in the repository. The change is metadata-only with no runtime impact.

Confidence Score: 5/5

Safe to merge — metadata-only .gitignore cleanup with no logic or runtime impact.

Single-file change removing dead ignore entries; no logic, tests, or runtime behavior affected. No issues found.

No files require special attention.

Important Files Changed

Filename	Overview
.gitignore	Removed the Cerebro ignore block (.cerebro/, .cursor/rules/cerebro.mdc, .claude/rules/cerebro.md) while correctly preserving .cursor/mcp.json and all other rules.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[.gitignore] --> B[Cerebro block REMOVED]
    A --> C[.cursor/mcp.json KEPT]
    A --> D[Claude worktrees block KEPT]
    B --> B1[# Cerebro knowledge base]
    B --> B2[.cerebro/]
    B --> B3[.cursor/rules/cerebro.mdc]
    B --> B4[.claude/rules/cerebro.md]

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[github-actions]

PR #570 Review — chore: remove obsolete Cerebro ignore entries

Summary

Metadata-only cleanup that removes four lines from .gitignore:

• The # Cerebro knowledge base section comment
• .cerebro/
• .cursor/rules/cerebro.mdc
• .claude/rules/cerebro.md

.cursor/mcp.json is intentionally retained. No runtime behavior changes; no tests or docs touched.

Findings

Correctness

• Verified the removed patterns are not referenced elsewhere in the repo (no tooling, workflow, or script depends on these paths being ignored).
• .cursor/mcp.json is preserved as stated in the PR description.
• Change is purely subtractive and fully reversible.

Style / Conventions

• Minor — orphaned entry. After the removal, .cursor/mcp.json sits alone in its block with no section-header comment, while every other group in the file has one (# Notebook build cache, # Claude worktrees, etc.). Consider either:
  • Adding a short header like # Cursor editor above .cursor/mcp.json, or
  • Folding .cursor/mcp.json into an adjacent section to avoid a dangling unlabeled line.
  • Not blocking, but would keep the file consistent with its own convention.

Tests / CI

• No test impact; the PR's N/A checkboxes for make test and unit/E2E are appropriate for a .gitignore-only change.

Security

• None. No secrets, no execution paths, no dependency changes.

Performance

• N/A.

Verdict

Looks good. Safe, scoped, and correctly described. Only suggestion is the cosmetic nit above about the now-orphaned .cursor/mcp.json line — optional, not a blocker.