feat(hud): F3 debug overlay — FPS, frame time, worst frame, state

A top-left readout for performance work: smoothed FPS and frame time, the worst frame in a rolling two-second window, the active view, player speed, a frame counter and the player's position in metres from the project origin. - **F3** toggles it, through the console variable so a packaged build can be checked without a rebuild (). - **On automatically** for and , so the performance capture never depends on pressing a key first; **off in the built demo**, because a player should not see an FPS counter over Hollywood Boulevard. - The first two seconds are a **warm-up window** excluded from the worst-frame figure. Without it the readout showed 'worst 400 ms' for a healthy run: the startup shader and streaming hitches dominated the rolling maximum. Measured cost on the self-test route at 1440p: 2.64 -> 2.77 ms average, about 5 %, still 6x the floor. The release-check number stays the overlay-off run; the overlay-on series is committed beside it as Docs/perf/0.2.0-walk-frametimes-overlay.csv. Docs: controls (F3 row, overlay section, switch table), release checks (cost row), architecture building block view (HUD and input list).
2026-11-09 12:40:48 +01:00
1 parent 12272d6b96
commit 73bce53a2b
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