Desktop shipped the same bug class four times in one week: a decorative
animation loop that never sleeps (bots face clock #88543, pixel egg #88406,
diffusion placeholder #88564, plus the #77651 hidden-renderer wave). Each fix
hand-rolled the same four behaviors. This extracts them into one helper in
src/lib/budgeted-loop.ts:
- fps budget (default 15) on top of rAF
- observability pause via the existing createRendererLoopPauseController
- idle dormancy: idleWhen() true after a draw parks the loop with zero
pending work until wake() — the piece every hand-rolled loop forgot
- teardown: dispose() cancels the frame, disposes the controller, and makes
wake() a no-op
DiffusionCanvas migrates onto it as the first consumer (net -40 lines at the
call site); its existing scheduling/budget/instance-cap tests pass unchanged
against the migrated implementation. Helper suite covers budget, pause,
park/wake, dormancy-survives-focus-churn, and dispose idempotency; sabotage
run (budget+dormancy stripped) fails 4/5.
Teknium
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