Add scripts/changeset/README.md specifying the cli.cjs extract
subcommand: invocation, flags, version validation, exit-code table
(0/1/2), and output shapes for text and --json modes.
Corrects two inaccuracies from the triage table against the source:
v-prefixed versions ARE accepted (stripped), and it is pre-release/
build suffixes that are rejected — not the v prefix. Also documents
the full exit-1 surface (missing flags, invalid semver, missing
changelog) and the exit-2 overlap (empty range vs malformed argv) so
external callers do not conflate "no releases in range" with failure.
Closes#23
Co-authored-by: CI Rebase Check <ci@gsd-redux>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
d3eaf6aec1