Follow-up to #1919 (archive-then-remove core). Closes the remaining #1871 acceptance criteria so phase history is preserved across the full milestone lifecycle, not just at phases.clear: - #2 src/milestone.cts + src/phases-command-router.cts: extract shared archivePhaseDirectories() helper; add cmdPhasesArchive (the previously half-wired phases.archive alias now routes instead of erroring Unknown). - #4 gsd-tools.cjs + src/milestone.cts: milestone complete archives phase dirs by default (--no-archive-phases opts out; --archive-phases is now a harmless no-op). complete-milestone.md updated to drop the redundant manual Yes/Skip archive prompt. - #3 gsd-core/workflows/new-milestone.md: §6 stages the archive move + source removal (git add .planning/milestones/ .planning/phases/) in the same commit as the milestone start, so the archive lands atomically — no orphaned uncommitted deletions, no un-archived dirs inherited. - docs/CLI-TOOLS.md (+ ja/zh/ko/pt) + help/modes/full.md: flag accuracy. - tests: phases archive command (#2) + milestone complete default archive / --no-archive-phases opt-out (#4). Goldens + workflow size baseline refreshed. Closes #1871
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