Two hardening changes to cmdMilestoneComplete:
1. Replace 27 lines of inline isDirInMilestone logic (roadmap parsing,
normalization, and matching) with a single call to the shared
getMilestonePhaseFilter(cwd) from core.cjs. The inline copy was
identical to the core version — deduplicating prevents future drift.
2. Handle empty MILESTONES.md files. Previously, an existing but empty
file would fall into the headerMatch branch and produce malformed
output. Now an empty file is treated the same as a missing one,
writing the standard "# Milestones" header before the entry.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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