EffectColorStripStream._animate_loop used to rebuild a 12-entry dict
``renderers = {"fire": self._render_fire, ...}`` on every frame, then
look up ``renderers.get(self._effect_type, self._render_fire)``. Two
audit smells (H1) at once: per-frame dict-rebuild churn and a silent
fallback to fire whenever ``self._effect_type`` was a typo or any
``_render_*`` method got renamed without updating the dict.
Fix:
* ``@_effect_renderer("fire")`` stamps an attribute on the unbound
method.
* ``@_collect_effect_renderers`` (applied to the class) walks
members at class-creation, gathers the marked ones into
``cls._RENDERERS``, and raises ``RuntimeError`` on duplicate
registration.
The loop now reads ``type(self)._RENDERERS`` once and calls the
unbound method with explicit ``self``. An unknown ``_effect_type``
logs a warning and skips the frame (sleep one frame_time) instead of
silently rendering fire — louder failure mode without crashing the
animation thread.
Tests: 5 new tests cover the 12-effect coverage set, callable shape,
class-level (not per-instance) dict identity, duplicate-name
rejection, and the marker stamp contract.
343 existing processing / storage / API tests stay green; ruff clean.
alexei.dolgolyov
97dae2cd62