perf(desktop): boot the renderer alongside the main bundle

[Hona]

Bottom of a 7-PR stack that gets the desktop window from "visible" to "shell rendered" in ~210 ms instead of ~660 ms. Each layer is independently reviewable; the numbers below are for the whole stack.

	PR	what
1	this	renderer boots the tick the window exists; entry chunk wires oc://, permissions, navigation, headers; shell gate values in argv
2	#50109	main waits for the renderer's asset burst before evaluating its bundle
3	#50110	renderer's initial module graph is one chunk
4	#50111	crash reporter, onboarding scan, log cleanup, certs/proxy/netlog, CLI resolve, palette, service probe off the path
5	#50112	renderer speaks the RPC wire format directly; Effect runtime out of its initial graph
6	#50113	preload hands the window its persisted stores; first render is the hydrated one
7	#50114	renderer CPU profiles attributed to source files (tooling)

gantt
  dateFormat X
  axisFormat %L
  section before
  entry → ready               :a1, 0, 134
  window shown                :a2, 134, 192
  main bundle + layers        :a3, 192, 484
  renderer boot               :a4, 484, 583
  wait for port + 4 RPCs      :a5, 583, 889
  section after
  entry → ready               :b1, 0, 133
  window shown + loadURL      :b2, 133, 186
  renderer boot (main idle, serving assets) :b3, 186, 281
  main bundle + layers        :b4, 314, 448
  compile + evaluate + hydrated render :b5, 281, 390

Loading

This layer: createEarlyWindow registers the oc:// handler, permissions, navigation policy and headers itself and calls loadURL in the same tick the window is created. The entry chunk stays Effect-free; the protocol handler reports through console until the logging layer installs a reporter. The window's argv carries firstLaunchPending and defaultServerUrl so the renderer can mount its shell without asking main; the locale is cached in localStorage for the same reason.

// main/index.ts
void app.whenReady().then(() => {
  createEarlyWindow()          // window + loadURL, before the main bundle is even imported
  return import("./desktop")
})

Packaged startup bench (bun run bench:startup), Windows laptop display, warm service, 5 interleaved runs, medians in ms since spawn, v2 vs the full stack:

	v2	stack
renderer process starts	468	179
DOM interactive	582	263
shell in DOM (titlebar tab)	853	387
composer editable	853	613
first pixels on screen	573	622
screen settled	1132	945

Window → shell: 664 → 210 ms. First pixels land ~50 ms later than before but as the complete hydrated frame; on stock Electron that instant is set by GPU shader compilation, which the renderer now finishes ahead of (electron/electron#54113 removes that wait).

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