Gating this behind an opt-in was the wrong call. A dev server already
executes arbitrary local JS — vite's module graph, every postinstall in
node_modules — so a loopback debugging port does not meaningfully widen
what a `npm run dev` session can already do, and `perf:serve` has opened
one unconditionally all along.
Requiring the variable also defeated the point: the tooling exists to be
reached for mid-task, and a capability you must remember to enable before
launching is one you don't have when you need it.
So the port opens on 9222 — the same port scripts/eval.mjs and
scripts/perf/lib/cdp.mjs already default to — for any dev-server run.
HERMES_DESKTOP_CDP_PORT stops being an on-switch and becomes an
override: a different port, or `off` to disable.
The hard gate is unchanged and still checked first: a packaged build
never opens the port, and no env value talks it into it. Neither does an
unpackaged `electron .` against dist/, which is how the packaged app
gets smoke tested.
Refusals only log when they contradict something the developer asked for
(a typo'd port, an explicit `off`). Packaged and dist runs are closed by
design and stay quiet.
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