feat(playground): implement Phase 1 control surface — compound axes, input pipeline, enhanced joy-map
Three new standalone ES modules + integration into a-app.js:
- input-pipeline.js: 5-stage processing (deadzone → zoom → curve → smoothing →
momentum-as-zoom), 3 anchor modes, zoom-at-zero freeze, per-axis overrides
- control-surface.js: compound axes (Boldness/Memory/Precision) with interpolation
tables, offset-based override resolution (trim-pot model), 6 built-in presets
- control-surface-ui.js: floating bar axis sliders, gear icon settings drawer with
Input/Training/Exploration/Output sections, log-scale sliders, override dots
- joy-map-enhanced.js: zoom minimap with adaptive grid (4×4→32×32), vanishing trail
with Catmull-Rom spline + tap-to-return, dual concentric noise rings, frozen overlay
Integration fixes from fresh-eyes review:
- getCurrentInputs()/setCurrentInputs() use cached pipeline coords (not raw)
- CSS noise ring hidden when canvas version active (no doubling)
- Input mode switch re-runs through pipeline
- Control surface state persisted to localStorage
Implements full Phase 1 of SPEC-controls.md plus bonus items from later phases
(zoom-aware feedback, control presets with override resolution, input curve/deadzone/
smoothing/momentum all wired).
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