docs: add agent.md

[Ri1tik]

Addressed Issues:

Fixes #(issue number)

Screenshots/Recordings:

Additional Notes:

AGENTS.md with architecture, scoping rules, and conventions

• Document project philosophy tied to GSoC proposal constraints
  (no backend, local-only storage, aggressive caching)
• Document repo-scoping rule (selectAnalysisRepos/getTopRepositories)
  and fetch caps by data type, with/without PAT
• Document AppContext state architecture and entry-point decision table
  (explore, runFullExplore, runGovernanceAnalysis, runAdvanceAnalytics,
  runFullAnalytics) with the stale-closure-safe pattern to follow
• Add Derived Metrics, Stable Contracts, UI Guidelines, Accessibility,
  Security, Error Handling, and Avoid Duplication sections
• Document known bugs already fixed once (hooks-after-early-return,
  fetchRepos arg-order mismatch, synchronous state clear causing
  page flicker) so they aren't reintroduced
• Add Performance Constraints, Testing expectations, and a
  Before-submitting-a-change checklist

Checklist

• My code follows the project's code style and conventions
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project maintainers there
• I have read the Contributing Guidelines

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📥 Commits

Reviewing files that changed from the base of the PR and between 6e5e627 and 9e80e96.

📒 Files selected for processing (1)

• agent.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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