sdl-0001: SDL_gamepad.c SDL_PrivateAddMappingForGUID — O(M) tail walk of
s_pSupportedGamepads linked list on every mapping insert → O(M²) bulk load.
SDL_GameControllerDB ships >30 000 entries; fix: tail pointer s_pLastSupportedGamepad.
box2d-0001: broad_phase.c b2UnBufferMove — linear scan through moveArray to
find proxy key on destroy (acknowledged by code comment) → O(N²) on bulk destroy.
Fix: index map (proxyKey → slot) for O(1) swap-remove.
