[codex] ROY-63: Add CLI commands and documentation for managing skills

[0xroylee]

Linear issue: ROY-63

This PR was created by the Agent-Driven Development Hub (ADHD.ai) workflow.

Includes:

• plan + implement session output
• separate review/testing session

[0xroylee]

ADHD.ai review for ROY-63

Result: FAIL

Token usage: input 495362, output 5336, total 500698

bun test passed with 255 tests, and bun run check plus bun run typecheck also passed. Review still fails because the new skill update path can erase existing skill bodies. I could not refresh origin/main because the sandbox denied writing .git/FETCH_HEAD, though the local main and origin/main refs matched before review.

Bugs were detected and sent back to implementation.

[0xroylee]

ADHD.ai review for ROY-63

Result: PASS

Token usage: input 632690, output 4917, total 637607

Reviewed PR #58 for ROY-63 and found no blocking bugs. bun test passed with 256 tests, and bun run check plus bun run typecheck also passed. The required git fetch was blocked by sandbox permissions on .git/FETCH_HEAD, but the PR base SHA matched the local main ref.

No bugs found.