The summary template writes task count as `**Tasks:** N` in the
Performance section, but `cmdMilestoneComplete` only counted
`## Task N` markdown headers — which don't exist in that format.
Now checks three patterns in order: `**Tasks:** N` field (primary),
`<task` XML tags, then `## Task N` headers (legacy fallback).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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