fix: use local> preset ref for private renovate-config repo

[27Bslash6]

Renovate can't resolve github> refs to private repos. Switch to local> which uses the GitHub App token.

Summary by CodeRabbit

• Chores
  • Updated .gitignore to exclude additional internal tooling and configuration artifacts from version control.
  • Modified Renovate preset configuration to resolve from a local source.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ede2126a-234c-4e12-af35-beac18f39e9f

📥 Commits

Reviewing files that changed from the base of the PR and between b90d14c and bf3bae7.

📒 Files selected for processing (2)

• .gitignore
• renovate.json

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📝 Walkthrough

Walkthrough

The PR updates two configuration files: .gitignore is extended to exclude internal AI agent artifacts and tooling directories, while renovate.json switches the shared preset source from GitHub-hosted to local resolution.

Changes

Cohort / File(s)	Summary
Configuration Updates .gitignore	Extended ignore patterns to exclude AI agent configuration artifacts, markdown config files, and hidden tooling directories from version control.
Dependency Management renovate.json	Updated extends configuration to resolve the shared Renovate preset from local source instead of GitHub-hosted source.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A config here, a gitignore there,
Local presets float through the air,
Artifacts hidden, tools tucked away,
Cleaner repos to save the day! ✨

🚥 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 and specifically describes the main change: switching from github> to local> preset reference for accessing a private renovate-config repository.
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 fix/renovate-preset

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