Update installed skills

Refresh the code carried by installed channel and provider skills. This does not re-run credential setup, change .env, alter wiring, or restart services.

Run from the NanoClaw project root. Use ordinary conversation for any choice; do not depend on a provider-specific question or skill-invocation tool.

1. Preflight and selection

Require a clean working tree:

git status --porcelain

If it is dirty, stop. Never mix a refresh with unrelated changes.