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Neil
c5102e1262
#11303 removed the O(sessions x roots) path normalization from the session worktree map, but nothing fails if that shape comes back. Adds the two checks that were missing, plus the tool that would have caught it. - timing guard: 1200 worktrees x 400 sessions must build in <150ms. Verified fail-first — restoring the pre-#11303 per-session buildWorktreeCandidates call takes it to 238ms; it is ~15ms as merged. - path boundary: '/repo/alpha-sibling' must not be attributed to '/repo/alpha'. Hoisting the root normalization out of the loop must not degrade containment into a bare startsWith. Also adds tools/benchmarks/workspace-switch-paint-latency.mjs, which attaches over CDP and measures first-paint-after-click and max frame gap. The existing worktree-switch-responsiveness.spec.ts only times the synchronous click task, which stays ~1ms because the highlight is a direct DOM mutation — that is why a ~1s stall could ship without tripping a budget. On the affected build it read maxFrameGap p50=973ms.