Phases with all summaries but no passing VERIFICATION.md now show as
"Executed" instead of "Complete", preventing false progress reporting.
Adds determinePhaseStatus() helper used by both cmdStats() and
cmdProgressRender(). Also fixes duplicate phase directory accumulation
in cmdStats() — plans/summaries from directories sharing the same
phase number are now summed instead of silently overwritten.
New statuses: Executed (summaries done, no verification), Needs Review
(verification exists with human_needed status).
Closes#1459
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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