refactor: localize command surface modules

[thymikee]

Summary

Localizes command surface and runtime ownership into src/commands/<family>/..., leaving root command files as thin composition/public-barrel layers.

Moves runtime implementations, CLI output maps, batch projection, and command-owned unit tests into their owning command families. Provider integration scenarios stay under test/integration because they exercise daemon/provider harness contracts rather than one command module.

Touched 77 files; scope expanded from the initial sample families to all command families per request. Docs/skills were not updated because this is a pure refactor with no user-facing command behavior change.

Validation

Focused migrated-command Vitest suite passed: 26 files, 307 tests.

pnpm check:quick passed.

pnpm check:unit passed: 256 unit files / 2436 tests, plus 8 smoke tests.

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	1.2 MB	1.2 MB	-901 B
JS gzip	400.1 kB	396.6 kB	-3.5 kB
npm tarball	519.3 kB	517.8 kB	-1.5 kB
npm unpacked	1.7 MB	1.7 MB	-901 B

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	29.0 ms	29.3 ms	+0.3 ms
CLI --help	44.8 ms	54.6 ms	+9.8 ms

Top changed chunks:

Chunk	Raw diff	Gzip diff
dist/src/3793.js	+134.0 kB	+40.3 kB
dist/src/7847.js	+10.4 kB	+3.7 kB
dist/src/input-actions.js	+9.4 kB	+3.6 kB
dist/src/8173.js	-9.3 kB	-3.5 kB
dist/src/123.js	-4.6 kB	-1.8 kB