cmdRoadmapAnalyze called fs.readdirSync(phasesDir) inside the
per-phase while loop, causing O(N^2) directory reads for N phases.
At 50 phases this produced 100 redundant syscalls; at 100 phases, 200.
Move the directory listing before the loop and build a lookup array
that is reused for each phase match. This reduces the pattern from
O(N^2) to O(N) directory reads.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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