docs: add real spec docs (PRD, FR, ADR, CLAUDE.md)

[KooshaPari]

Summary

• Adds PRD.md with epics and user stories grounded in the actual codebase
• Adds FUNCTIONAL_REQUIREMENTS.md with FR-{CAT}-NNN SHALL statements traced to PRD epics
• Adds ADR.md with architecture decisions and rationale
• Updates/adds CLAUDE.md with stack table, key commands, structure, and development rules

Files Changed

• PRD.md — Product requirements with epics and acceptance criteria
• FUNCTIONAL_REQUIREMENTS.md — Functional requirements with FR IDs and PRD traces
• ADR.md — Architecture decision records
• CLAUDE.md — Agent/developer instructions for this repo

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 6a90e255-9d33-4b7f-b292-e794b762e6e4

📥 Commits

Reviewing files that changed from the base of the PR and between 6dfbd75 and 5a0fdeb.

📒 Files selected for processing (4)

• ADR.md
• CLAUDE.md
• FUNCTIONAL_REQUIREMENTS.md
• PRD.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/spec-docs

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