chore(gitignore): ignore ANVIL harness + local review notes

[JosephOIbrahim]

What

Adds the machine-local operating material to .gitignore, following the existing "keep local (public repo)" convention already used for the fieldhouse entries: the ANVIL autonomous-build harness (.anvil/ + its two docs), the local system-prompt reference, the hand-verified codebase review, and .coverage debris.

Why

The keep-local policy has been enforced by hand so far — during this week's work an autonomous git add -A swept these files into a (deliberately unpushed) local branch. Encoding the policy in .gitignore makes that class of near-miss structurally impossible on master.

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6a16112d-1c6e-415e-99c5-a1706638cc3c

📥 Commits

Reviewing files that changed from the base of the PR and between b8a9dc1 and 21247a7.

📒 Files selected for processing (1)

• .gitignore

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/keep-local-gitignore

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