`desktop.electron_flags` was appended to argv only by the `hermes desktop`
launcher, so a packaged app started from its Start-menu / .desktop entry
never saw it, and nothing set `--js-flags` at all — three Windows reporters
on #77311 confirmed `jsflags=NO` on the renderer command line and OOM
crash-loops with 15 GB of free RAM. Chromium copies `js-flags` to renderer
processes only from the browser's pre-`ready` command line, so main.ts now
reads the two launch keys out of config.yaml itself (no YAML dependency in
the main bundle: a deliberately narrow subset reader) and applies them via
app.commandLine before ready.
New typed knob `desktop.renderer_max_old_space_mb` (default 0 = Chromium
default) becomes `--js-flags=--max-old-space-size=N`, MERGED with any
existing js-flags (appendSwitch replaces, so a naive apply would drop one).
The planner is pure (`electron/renderer-heap-flags.ts`) and vitest-covered.
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