perf(tui): full-pipeline instrumentation + profiling harness

Extends HERMES_DEV_PERF to capture the complete render pipeline, not
just React commits. Adds scripts/profile-tui.py to drive repeatable
hold-PageUp stress tests against a real long session.

perfPane.tsx:
  Wires ink's onFrame callback (already plumbed through the fork) into
  the same perf.log as the React.Profiler samples. Captures per-phase
  timing (yoga calculateLayout, renderNodeToOutput, screen diff, patch
  optimize, stdout write) plus yoga counters (visited/measured/cache-
  Hits/live) and patch counts per frame.  Events are tagged
  {src: 'react'|'frame'} so jq can split them.  logFrameEvent is
  undefined when HERMES_DEV_PERF is unset, so ink doesn't even attach
  the callback.

entry.tsx:
  Passes logFrameEvent into render().

types/hermes-ink.d.ts:
  Declares FrameEvent + onFrame on RenderOptions so the ui-tui side
  type-checks against the plumbed-through ink option.

scripts/profile-tui.py:
  New harness. Launches the built TUI under a PTY with the longest
  session in state.db resumed, holds PageUp/PageDown/etc at a
  configurable Hz for N seconds, then parses perf.log and prints
  per-phase p50/p95/p99/max plus yoga-counter summaries. Zero deps
  beyond stdlib. Exit 2 if nothing was captured (wiring broken).

Initial findings (1106-msg session, 6s PageUp hold at 30Hz):
  - Steady state: 10 fps; renderer phase p99=63ms, write p99=0.2ms
  - 4/107 heavy frames (>=16ms), all dominated by renderNodeToOutput
  - One pathological 97ms frame with yoga measuring 70,415 text cells
    and Yoga visiting 225k nodes — the cold-unmeasured-region hit
  - Ink's scroll fast-path (DECSTBM blit from prevScreen) is
    disqualified because our spacer-based virtual history doesn't
    keep heightDelta in sync with scroll.delta, so every PageUp step
    falls through to a full 2000-4800 patch re-render instead of ~40

ui-tui/src/entry.tsx

@@ -41,6 +41,10 @@ if (process.env.HERMES_HEAPDUMP_ON_START === '1') {
 
 process.on('beforeExit', () => stopMemoryMonitor())
 
-const [{ render }, { App }] = await Promise.all([import('@hermes/ink'), import('./app.js')])
+const [{ render }, { App }, { logFrameEvent }] = await Promise.all([
+  import('@hermes/ink'),
+  import('./app.js'),
+  import('./lib/perfPane.js')
+])
 
-render(<App gw={gw} />, { exitOnCtrlC: false })
+render(<App gw={gw} />, { exitOnCtrlC: false, onFrame: logFrameEvent })