chore: move ci.py to ~/.claude/scripts (uv inline script, no project dep)

Script now lives globally as a uv inline-dependency script.
Removes per-project scripts/ci.py and the msgspec dev dependency.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

uv.lock

@@ -150,6 +150,11 @@ dependencies = [
 ]
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