feat(ops): first-class key rotation (make rotate-key + runbook)

[JosephOIbrahim]

What

Makes API-key rotation a first-class, discoverable command.

The script itself — scripts/rotate_anthropic_key.sh — already shipped on master (bundled into #16's 3e0343e). This focused follow-up adds the tooling + docs around it:

• make rotate-key — one command; runs the script (paste the new key, input hidden).
• docs/key-rotation.md — a short runbook: rotate locally, then delete the old key in the console.

Why

The bare script landed bundled with a README change, so it wasn't discoverable on its own. This elevates it to a documented, one-command procedure.

The script validates the new key against the Anthropic API before changing anything, persists it (launchctl + a chmod 600 login agent), bounces the daemon, and never prints the key. The MCP coaching surface uses no Claude credential, so rotation never disrupts it.

🤖 Generated with Claude Code

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4f18ca1a-c072-4aad-9c7c-9cd67c3b5f93

📥 Commits

Reviewing files that changed from the base of the PR and between be08561 and 17835c0.

📒 Files selected for processing (2)

• Makefile
• docs/key-rotation.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/key-rotation-tooling

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