* fix(#1224): accept --pr 0 placeholder at changeset creation
The required-field guard `!opts.pr` treated the integer 0 as falsy,
rejecting the documented `pr: 0` two-push placeholder with a usage
error (exit 2). Non-numeric `--pr abc` (NaN) was also silently
accepted before (passes `!NaN === true`... actually `!NaN` is true, so
NaN would trigger the guard already). The new explicit checks use
`opts.pr === null` for missing flag and `Number.isNaN` for non-numeric
input, accepting all finite integer values including 0.
The merge-time safety net in parse.cjs (`pr <= 0` → INVALID_PR) is
unchanged — a pr:0 fragment is still rejected at lint/render time.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* chore(#1224): backfill changeset PR number (#1231)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
cafb874c4a