Add CLAUDE.md agent guardrails (docs only)

[swimmer-303]

Split out from #254 as a documentation-only change, per review feedback.

Adds a CLAUDE.md with agent guardrails (git, filesystem, dependency, database, and behavior rules) for contributors using coding agents on FreeFlow. No code changes.

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Reviewing files that changed from the base of the PR and between 7427ca9 and ce5a83d.

📒 Files selected for processing (1)

• CLAUDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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