refactor(cli): extract subcommand handlers into separate modules

[jafreck]

Summary

Extracts the 727-line monolithic cli.ts into a thin dispatcher + 6 command modules + shared args utility.

Motivation

cli.ts housed argument parsing, 6+ subcommand implementations, config resolution, process lifecycle, and logging setup in one procedural file. Adding a new command meant editing a 700-line file.

Changes

• src/cli.ts → 68 lines (thin dispatcher with signal handlers)
• src/cli/args.ts — shared argument utilities
• 6 command modules in src/cli/commands/:
  • index-cmd.ts (162 lines)
  • serve-cmd.ts (123 lines)
  • refresh-cmd.ts (159 lines)
  • analyze-cmd.ts (72 lines)
  • install-scip-cmd.ts (39 lines)
  • hooks-cmd.ts (89 lines)

Testing

All existing tests pass. Zero new failures introduced.

[codecov]

Codecov Report

❌ Patch coverage is 82.60870% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.36%. Comparing base (9cd4039) to head (205c344).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cli/commands/serve-cmd.ts	37.28%	37 Missing ⚠️
src/cli/commands/refresh-cmd.ts	84.81%	12 Missing ⚠️
src/cli/commands/hooks-cmd.ts	88.23%	4 Missing ⚠️
src/cli/commands/index-cmd.ts	95.40%	4 Missing ⚠️
src/cli/commands/install-scip-cmd.ts	84.21%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #441   +/-   ##
=======================================
  Coverage   89.35%   89.36%           
=======================================
  Files          93      100    +7     
  Lines        9670     9683   +13     
  Branches     3013     3013           
=======================================
+ Hits         8641     8653   +12     
- Misses       1029     1030    +1     

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