Add tickgit TODO guard

[MTG-Thomas]

Adds the pinned tickgit v0.0.17 TODO guard workflow with a committed zero-item baseline. The guard runs on PRs, weekdays on schedule, and manually with read-only permissions and generated-artifact paths ignored.

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Summary by CodeRabbit

• Chores
  • Added automated GitHub Actions workflow to enforce code quality standards through scheduled and pull request-based checks, with concurrency control and restricted permissions enabled.

[coderabbitai]

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: 189732a2-47a3-4e8d-ada6-e815994a46b4

📥 Commits

Reviewing files that changed from the base of the PR and between 5656b66 and 21e945f.

⛔ Files ignored due to path filters (1)

• .github/tickgit-baseline.csv is excluded by !**/*.csv

📒 Files selected for processing (1)

• .github/workflows/tickgit-todo-guard.yml

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📝 Walkthrough

Walkthrough

Added a new GitHub Actions workflow that automatically detects and prevents TODO, FIXME, and HACK comments from being merged. The workflow runs on pull request events and a scheduled weekday cron, using the tickgit tool with a CSV baseline to fail when new code markers are introduced, enforcing consistent code quality standards.

Changes

Tickgit Code Quality Guard

Layer / File(s)	Summary
Tickgit TODO enforcement workflow .github/workflows/tickgit-todo-guard.yml	Workflow runs on PR events (opened/synchronize/reopened) and weekday cron schedule with manual dispatch support. Configures tickgit action with CSV baseline, reads contents with read-only permissions, defines concurrency per ref, and fails if new TODO/FIXME/HACK matches are detected outside configured ignore paths.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A guardian workflow hops in place,
Sniffing out TODOs without a trace,
No more TODO: fix this someday in sight,
The tickgit keeps our codebase tight! ✨

🚥 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 change: adding a GitHub Actions workflow for tickgit TODO guard checks.
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 codex/add-tickgit-todo-guard

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