v0.0.38: perf wave 2 (clear-search, terminal truncation, FTS dirty-flag, outputBuffer)

[JeanBaptisteRenard]

Version bump to v0.0.38, bundling the second performance/rendering wave (all already merged to main, reviewed by dedicated reviewer agents — no self-review):

• (perf): cut sidebar clear-search render lag (morphdom callback fast-path) #73 — sidebar clear-search render lag (morphdom js-stateful fast-path + rAF)
• (terminal): fix bottom-row truncation — clamp fit to content box #76 — terminal bottom-row truncation (safeFit content-box clamp + NaN guard)
• (perf): FTS dirty-flag — skip reindex on tab switch when files unchanged #74 — FTS dirty-flag (skip index rebuild on Memory/Work-Files tab switch when files unchanged)
• (perf): coalesce PTY outputBuffer to cut per-session memory overhead #75 — PTY outputBuffer coalesce (cut per-session array overhead, retain ~256KB reattach scrollback)

Renderer/main-process only — no native-module or schema changes; drop-in upgrade.

Tag will be created on the merged main commit (after this merges) to trigger the Build & Release workflow.