The regex-based table parser captured a fixed number of columns,
so 5-column tables (Phase | Milestone | Plans | Status | Completed)
had the Milestone column eaten and Status/Date written to wrong cells.
Replaced regex with cell-based `split('|')` parsing that detects
column count (4 or 5) and updates the correct cells by index.
Affects both `cmdRoadmapUpdatePlanProgress` and `cmdPhaseComplete`.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
e3bc614eb7