src/cli.ts was 943 lines, exceeding the 450-line rule from AGENTS.md.

Split into smaller modules under src/cli/:

• src/cli.ts: 181 lines (orchestrator)
• src/cli/args.ts: 66 lines
• src/cli/commands/convenience.ts: 335 lines
• src/cli/commands/daiso.ts: 165 lines
• src/cli/constants.ts: 6 lines
• src/cli/deps.ts: 57 lines
• src/cli/http.ts: 120 lines
• src/cli/types.ts: 20 lines

All files now under 450 lines.

Verification:

• pnpm typecheck: passed
• pnpm test: 1 pre-existing failure (직접 실행 여부를 올바르게 판별한다), unrelated to this refactor

No public CLI commands or runtime behavior changed.