# Pico-Side Animations - Phase 1

Move all animation logic from Pi's `light_service.py` to Pico's `firmware/main.py`.
Pi becomes a thin HTTP-to-serial bridge.

## New Serial Protocol

| Input | Example | Response | Description |
|-------|---------|----------|-------------|
| `<int>` | `72` | *(none)* | Jaw amplitude 0-100, fire-and-forget |
| `mood <mode>` | `mood thinking` | `OK` | Switch mood animation |
| `jaw <mode>` | `jaw talking` | `OK` | Switch jaw animation |

Mood modes: idle, listening, responding, pleasure, thinking, playful, commanding, love, sleep, off
Jaw modes: idle, talking, off

Bare integers are jaw amplitude (fast path, no response). This replaces per-LED serial flooding.

## Pico Firmware Architecture

Non-blocking main loop:
1. Check serial (non-blocking poll)
2. If data: integer -> jaw amplitude; string -> mode command
3. Tick mood animation (based on mood_mode + time)
4. Tick jaw animation (based on jaw_mode or amplitude)
5. ~10-20ms frame pacing

All 9 mood animations ported from light_service.py using `time.ticks_ms()`.
Jaw: "level" mode maps 0-100 to 13 LEDs, "talking" mode oscillates autonomously.

## Pi light_service.py Changes

Remove: all animation logic, mood_buffer, per-LED helpers, main animation loop.
Keep: HTTP API, serial connection management.
POST /state -> sends `mood <state>\n`, waits for OK.
POST /jaw/level -> sends `<level>\n`, fire-and-forget (no readline).

## Files Changed

- `firmware/main.py` - Full rewrite with animation engine
- `light_service.py` - Strip down to HTTP-to-serial bridge