* fix(#2288): archive phase history under the outgoing milestone version
phases.clear derived its archive directory from a live getMilestoneInfo()
read, but new-milestone.md switches the milestone BEFORE phases.clear runs,
so phase history was filed under the NEW milestone's <version>-phases/ dir.
Add a --archive-version override (threaded from new-milestone.md, captured
before the switch) with precedence override -> live read -> dated label.
Harden the version label against path traversal on both phases.clear and the
sibling milestone-complete sink (the label is a moved directory name), and
persist the outgoing version via a file + quoted shell expansion so untrusted
STATE.md content is never re-parsed by the shell.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* docs(#2288): backfill PR number 2323 into changesets
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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