The flock wrapper checked _web_ui_build_needed twice (pre-lock fast path
and post-lock re-check) and _do_build_web_ui checks it again internally,
so a boot that actually built walked the whole web/ source tree three
times. The callee's own check already runs under the lock on every path
through the wrapper, so it alone is sufficient: drop both wrapper checks.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Concurrent dashboard boots (desktop retry loop) each spawned their own
npm install + vite build over the same tree; parallel builds starved
each other, the dist sentinel never advanced, and every boot re-triggered
the build — cascading into orphan backends, port collisions, and CPU
storms that also knocked out the Telegram gateway's heartbeat (2026-07-12).
One process now builds under flock; the rest serve the existing dist
(stale is acceptable) or wait for the first-ever build to finish.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
