[Build] Optimize CLAUDE.md and add typecheck script

[samzong]

Summary

Slim down CLAUDE.md from 393 to 151 lines by extracting completed phase records and technical pitfalls into Claude Code memory (local-only). Add a pnpm typecheck script and remove stale planning docs.

Type of change

• [Build] CI, packaging, or tooling change

Why is this needed?

CLAUDE.md is loaded into every Claude Code conversation context. At 393 lines, ~60% was completed phase checklists, reverse-engineering notes, and one-time pitfall records with no value for future work. The two-stage tsc typecheck command was too long to type manually.

What changed?

• CLAUDE.md: 393 → 151 lines — removed completed phase history (1-3.5), task dependency graph, device auth reverse-engineering details, streaming protocol notes, and technical pitfall records
• package.json: added typecheck script wrapping the two-stage tsc build
• docs/plan/: removed stale planning docs (architecture-refactor.md, model-agent-thinking-research.md)

Linked issues

N/A

Validation

• pnpm typecheck
• pnpm test
• pnpm build
• Manual smoke test
• Not run

Commands, screenshots, or notes:

pnpm typecheck — zero errors

Screenshots or recordings

N/A

Release note

• No user-facing change. Release note is NONE.

NONE

Checklist

• The PR title uses at least one approved prefix
• The summary explains both what changed and why
• Validation reflects the commands actually run for this PR
• The release note block is accurate

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