feat(figment): add test fixture SVG and FIGMENT_TRIGGER event type

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -9,3 +9,4 @@ htmlcov/
 .coverage
 .pytest_cache/
 *.egg-info/
+.DS_Store

docs/superpowers/specs/2026-03-19-figment-mode-design.md

@@ -0,0 +1,308 @@
+# Figment Mode Design Spec
+
+> Periodic full-screen SVG glyph overlay with flickery animation, theme-aware coloring, and extensible physical device control.
+
+## Overview
+
+Figment mode displays a randomly selected SVG from the `figments/` directory as a flickery, glitchy half-block terminal overlay on top of the running ticker. It appears once per minute (configurable), holds for ~4.5 seconds with a three-phase animation (progressive reveal, strobing hold, dissolve), then fades back to the ticker. Colors are randomly chosen from the existing theme gradients.
+
+The feature is designed for extensibility: a generic input protocol allows MQTT, ntfy, serial, or any other control surface to trigger figments and adjust parameters in real time.
+
+## Goals
+
+- Display SVG figments as half-block terminal art overlaid on the running ticker
+- Three-phase animation: progressive reveal, strobing hold, dissolve
+- Random color from existing theme gradients (green, orange, purple)
+- Configurable interval and duration via C&C
+- Extensible input abstraction for physical device control (MQTT, serial, etc.)
+
+## Out of Scope
+
+- Multi-figment simultaneous display (one at a time)
+- SVG animation support (static SVGs only; animation comes from the overlay phases)
+- Custom color palettes beyond existing themes
+- MQTT and serial adapters (v1 ships with ntfy C&C only; protocol is ready for future adapters)
+
+## Architecture: Hybrid Plugin + Overlay
+
+The figment is an **EffectPlugin** for lifecycle, discovery, and configuration, but delegates rendering to a **layers-style overlay helper**. This avoids stretching the `EffectPlugin.process()` contract (which transforms line buffers) while still benefiting from the plugin system for C&C, auto-discovery, and config management.
+
+**Important**: The plugin class is named `FigmentEffect` (not `FigmentPlugin`) to match the `*Effect` naming convention required by `discover_plugins()` in `effects_plugins/__init__.py`. The plugin is **not** added to the `EffectChain` order list — its `process()` is a no-op that returns the buffer unchanged. The chain only processes effects that transform buffers (noise, fade, glitch, firehose). Figment's rendering happens via the overlay path in `scroll.py`, outside the chain.
+
+### Component Diagram
+
+```
+                     +-------------------+
+                     |  FigmentTrigger   |  (Protocol)
+                     |  - NtfyTrigger    |  (v1)
+                     |  - MqttTrigger    |  (future)
+                     |  - SerialTrigger  |  (future)
+                     +--------+----------+
+                              |
+                              | FigmentCommand
+                              v
++------------------+    +-----------------+    +----------------------+
+| figment_render   |<---| FigmentEffect   |--->| render_figment_      |
+| .py              |    | (EffectPlugin)  |    | overlay() in         |
+|                  |    |                 |    | layers.py            |
+| SVG -> PIL ->    |    | Timer, state    |    |                      |
+| half-block cache |    | machine, SVG    |    | ANSI cursor-position |
+|                  |    | selection       |    | commands for overlay |
++------------------+    +-----------------+    +----------------------+
+                              |
+                              | get_figment_state()
+                              v
+                     +-------------------+
+                     | scroll.py         |
+                     +-------------------+
+```
+
+## Section 1: SVG Rasterization
+
+**File: `engine/figment_render.py`**
+
+Reuses the same PIL-based half-block encoding that `engine/render.py` uses for OTF fonts.
+
+### Pipeline
+
+1. **Load**: `cairosvg.svg2png()` converts SVG to PNG bytes in memory (no temp files)
+2. **Resize**: PIL scales to fit terminal — width = `tw()`, height = `th() * 2` pixels (each terminal row encodes 2 pixel rows via half-blocks)
+3. **Threshold**: Convert to greyscale ("L" mode), apply binary threshold to get visible/not-visible
+4. **Half-block encode**: Walk pixel pairs top-to-bottom. For each 2-row pair, emit `█` (both lit), `▀` (top only), `▄` (bottom only), or space (neither)
+5. **Cache**: Results cached per `(svg_path, terminal_width, terminal_height)` — invalidated on terminal resize
+
+### Dependency
+
+`cairosvg` added as an optional dependency in `pyproject.toml` (like `sounddevice`). If `cairosvg` is not installed, the `FigmentEffect` class will fail to import, and `discover_plugins()` will silently skip it (the existing `except Exception: pass` in discovery handles this). The plugin simply won't appear in the registry.
+
+### Key Function
+
+```python
+def rasterize_svg(svg_path: str, width: int, height: int) -> list[str]:
+    """Convert SVG file to list of half-block terminal rows (uncolored)."""
+```
+
+## Section 2: Figment Overlay Rendering
+
+**Integration point: `engine/layers.py`**
+
+New function following the `render_message_overlay()` pattern.
+
+### FigmentState Dataclass
+
+Defined in `effects_plugins/figment.py`, passed between the plugin and the overlay renderer:
+
+```python
+@dataclass
+class FigmentState:
+    phase: FigmentPhase          # enum: REVEAL, HOLD, DISSOLVE
+    progress: float              # 0.0 to 1.0 within current phase
+    rows: list[str]              # rasterized half-block rows (uncolored)
+    gradient: list[int]          # 12-color ANSI 256 gradient from chosen theme
+    center_row: int              # top row for centering in viewport
+    center_col: int              # left column for centering in viewport
+```
+
+### Function Signature
+
+```python
+def render_figment_overlay(figment_state: FigmentState, w: int, h: int) -> list[str]:
+    """Return ANSI cursor-positioning commands for the current figment frame."""
+```
+
+### Animation Phases (~4.5 seconds total)
+
+Progress advances each frame as: `progress += config.FRAME_DT / phase_duration`. At 20 FPS (FRAME_DT=0.05s), a 1.5s phase takes 30 frames to complete.
+
+| Phase | Duration | Behavior |
+|-------|----------|----------|
+| **Reveal** | ~1.5s | Progressive scanline fill. Each frame, a percentage of the figment's non-empty cells become visible in random block order. Intensity scales reveal speed. |
+| **Hold** | ~1.5s | Full figment visible. Strobes between full brightness and dimmed/partial visibility every few frames. Intensity scales strobe frequency. |
+| **Dissolve** | ~1.5s | Inverse of reveal. Cells randomly drop out, replaced by spaces. Intensity scales dissolve speed. |
+
+### Color
+
+A random theme gradient is selected from `THEME_REGISTRY` at trigger time. Applied via `lr_gradient()` — the same function that colors headlines and messages.
+
+### Positioning
+
+Figment is centered in the viewport. Each visible row is an ANSI `\033[row;colH` command appended to the buffer, identical to how the message overlay works.
+
+## Section 3: FigmentEffect (Effect Plugin)
+
+**File: `effects_plugins/figment.py`**
+
+An `EffectPlugin(ABC)` subclass named `FigmentEffect` to match the `*Effect` discovery convention.
+
+### Chain Exclusion
+
+`FigmentEffect` is registered in the `EffectRegistry` (for C&C access and config management) but is **not** added to the `EffectChain` order list. Its `process()` returns the buffer unchanged. The `enabled` flag is checked directly by `scroll.py` when deciding whether to call `get_figment_state()`, not by the chain.
+
+### Responsibilities
+
+- **Timer**: Tracks elapsed time via `config.FRAME_DT` accumulation. At the configured interval (default 60s), triggers a new figment.
+- **SVG selection**: Randomly picks from `figments/*.svg`. Avoids repeating the last shown.
+- **State machine**: `idle -> reveal -> hold -> dissolve -> idle`. Tracks phase progress (0.0 to 1.0).
+- **Color selection**: Picks a random theme key (`"green"`, `"orange"`, `"purple"`) at trigger time.
+- **Rasterization**: Calls `rasterize_svg()` on trigger, caches result for the display duration.
+
+### State Machine
+
+```
+idle ──(timer fires or trigger received)──> reveal
+reveal ──(progress >= 1.0)──> hold
+hold ──(progress >= 1.0)──> dissolve
+dissolve ──(progress >= 1.0)──> idle
+```
+
+### Interface
+
+The `process()` method returns the buffer unchanged (no-op). The plugin exposes state via:
+
+```python
+def get_figment_state(self, frame_number: int) -> FigmentState | None:
+    """Tick the state machine and return current state, or None if idle."""
+```
+
+This mirrors the `ntfy_poller.get_active_message()` pattern.
+
+### Scroll Loop Access
+
+`scroll.py` imports `FigmentEffect` directly and uses `isinstance()` to safely downcast from the registry:
+
+```python
+from effects_plugins.figment import FigmentEffect
+
+plugin = registry.get("figment")
+figment = plugin if isinstance(plugin, FigmentEffect) else None
+```
+
+This is a one-time setup check, not per-frame. If `cairosvg` is missing, the import is wrapped in a try/except and `figment` stays `None`.
+
+### EffectConfig
+
+- `enabled`: bool (default `False` — opt-in)
+- `intensity`: float — scales strobe frequency and reveal/dissolve speed
+- `params`:
+  - `interval_secs`: 60 (time between figments)
+  - `display_secs`: 4.5 (total animation duration)
+  - `figment_dir`: "figments" (SVG source directory)
+
+Controllable via C&C: `/effects figment on`, `/effects figment intensity 0.7`.
+
+## Section 4: Input Abstraction (FigmentTrigger)
+
+**File: `engine/figment_trigger.py`**
+
+### Protocol
+
+```python
+class FigmentTrigger(Protocol):
+    def poll(self) -> FigmentCommand | None: ...
+```
+
+### FigmentCommand
+
+```python
+class FigmentAction(Enum):
+    TRIGGER = "trigger"
+    SET_INTENSITY = "set_intensity"
+    SET_INTERVAL = "set_interval"
+    SET_COLOR = "set_color"
+    STOP = "stop"
+
+@dataclass
+class FigmentCommand:
+    action: FigmentAction
+    value: float | str | None = None
+```
+
+Uses an enum for consistency with `EventType` in `engine/events.py`.
+
+### Adapters
+
+| Adapter | Transport | Dependency | Status |
+|---------|-----------|------------|--------|
+| `NtfyTrigger` | Existing C&C ntfy topic | None (reuses ntfy) | v1 |
+| `MqttTrigger` | MQTT broker | `paho-mqtt` (optional) | Future |
+| `SerialTrigger` | USB serial | `pyserial` (optional) | Future |
+
+**NtfyTrigger v1**: Subscribes as a callback on the existing `NtfyPoller`. Parses messages with a `/figment` prefix (e.g., `/figment trigger`, `/figment intensity 0.8`). This is separate from the `/effects figment on` C&C path — the trigger protocol allows external devices to send commands without knowing the effects controller API.
+
+### Integration
+
+The `FigmentEffect` accepts a list of triggers. Each frame, it polls all triggers and acts on commands. Triggers are optional — if none are configured, the plugin runs on its internal timer alone.
+
+### EventBus Bridge
+
+A new `FIGMENT_TRIGGER` variant is added to the `EventType` enum in `engine/events.py`, with a corresponding `FigmentTriggerEvent` dataclass. Triggers publish to the EventBus for other components to react (logging, multi-display sync).
+
+## Section 5: Scroll Loop Integration
+
+Minimal change to `engine/scroll.py`:
+
+```python
+# In stream() setup (with safe import):
+try:
+    from effects_plugins.figment import FigmentEffect
+    _plugin = registry.get("figment")
+    figment = _plugin if isinstance(_plugin, FigmentEffect) else None
+except ImportError:
+    figment = None
+
+# In frame loop, after effects processing, before ntfy message overlay:
+if figment and figment.config.enabled:
+    figment_state = figment.get_figment_state(frame_number)
+    if figment_state is not None:
+        figment_overlay = render_figment_overlay(figment_state, w, h)
+        buf.extend(figment_overlay)
+```
+
+### Overlay Priority
+
+Figment overlay appends **after** effects processing but **before** the ntfy message overlay. This means:
+- Ntfy messages always appear on top of figments (higher priority)
+- Existing glitch/noise effects run over the ticker underneath the figment
+
+Note: If more overlay types are added in the future, a priority-based overlay system should replace the current positional ordering.
+
+## Section 6: Error Handling
+
+| Scenario | Behavior |
+|----------|----------|
+| `cairosvg` not installed | `FigmentEffect` fails to import; `discover_plugins()` silently skips it; `scroll.py` import guard sets `figment = None` |
+| `figments/` directory missing | Plugin logs warning at startup, stays in permanent `idle` state |
+| `figments/` contains zero `.svg` files | Same as above: warning, permanent `idle` |
+| Malformed SVG | `cairosvg` raises exception; plugin catches it, skips that SVG, picks another. If all SVGs fail, enters permanent `idle` with warning |
+| Terminal resize during animation | Re-rasterize on next frame using new dimensions. Cache miss triggers fresh rasterization. Animation phase/progress are preserved; only the rendered rows update |
+
+## Section 7: File Summary
+
+### New Files
+
+| File | Purpose |
+|------|---------|
+| `effects_plugins/figment.py` | FigmentEffect — lifecycle, timer, state machine, SVG selection, FigmentState/FigmentPhase |
+| `engine/figment_render.py` | SVG to half-block rasterization pipeline |
+| `engine/figment_trigger.py` | FigmentTrigger protocol, FigmentAction enum, FigmentCommand, NtfyTrigger adapter |
+| `figments/` | SVG source directory (ships with sample SVGs) |
+| `tests/test_figment.py` | FigmentEffect lifecycle, state machine transitions, timer |
+| `tests/test_figment_render.py` | SVG rasterization, caching, edge cases |
+| `tests/test_figment_trigger.py` | FigmentCommand parsing, NtfyTrigger adapter |
+| `tests/fixtures/test.svg` | Minimal SVG for deterministic rasterization tests |
+
+### Modified Files
+
+| File | Change |
+|------|--------|
+| `engine/scroll.py` | Figment overlay integration (setup + per-frame block) |
+| `engine/layers.py` | Add `render_figment_overlay()` function |
+| `engine/events.py` | Add `FIGMENT_TRIGGER` to `EventType` enum, add `FigmentTriggerEvent` dataclass |
+| `pyproject.toml` | Add `cairosvg` as optional dependency |
+
+## Testing Strategy
+
+- **Unit**: State machine transitions (idle→reveal→hold→dissolve→idle), timer accuracy (fires at interval_secs), SVG rasterization output dimensions, FigmentCommand parsing, FigmentAction enum coverage
+- **Integration**: Plugin discovery (verify `FigmentEffect` is found by `discover_plugins()`), overlay rendering with mock terminal dimensions, C&C command handling via `/effects figment on`
+- **Edge cases**: Missing figments dir, empty dir, malformed SVG, cairosvg unavailable, terminal resize mid-animation
+- **Fixture**: Minimal `test.svg` (simple rectangle) for deterministic rasterization tests

engine/events.py

@@ -18,6 +18,7 @@ class EventType(Enum):
     NTFY_MESSAGE = auto()
     STREAM_START = auto()
     STREAM_END = auto()
+    FIGMENT_TRIGGER = auto()
 
 
 @dataclass
@@ -65,3 +66,12 @@ class StreamEvent:
     event_type: EventType
     headline_count: int = 0
     timestamp: datetime | None = None
+
+
+@dataclass
+class FigmentTriggerEvent:
+    """Event emitted when a figment is triggered."""
+
+    action: str
+    value: float | str | None = None
+    timestamp: datetime | None = None

figments/animal-head-symbol-of-mexico-antique-cultures-svgrepo-com.svg

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figments/mayan-mask-of-mexico-svgrepo-com.svg

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+			C483.902,376.6,474.101,378.465,463.82,378.465z"/>
+		<path d="M261.746,512.598c0,18.102,14.669,32.818,32.704,32.818c18.034,0,32.704-14.726,32.704-32.818
+			c0-18.092-14.67-32.818-32.704-32.818C276.415,479.779,261.746,494.506,261.746,512.598z"/>
+	</g>
+</g>
+</svg>

mise.toml

@@ -1,3 +1,7 @@
+[env]
+_.path = ["/opt/homebrew/lib"]
+DYLD_LIBRARY_PATH = "/opt/homebrew/lib"
+
 [tools]
 python = "3.12"
 hk = "latest"

pyproject.toml

@@ -30,6 +30,9 @@ mic = [
     "sounddevice>=0.4.0",
     "numpy>=1.24.0",
 ]
+figment = [
+    "cairosvg>=2.7.0",
+]
 dev = [
     "pytest>=8.0.0",
     "pytest-cov>=4.1.0",

tests/fixtures/test.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100">
+  <rect x="10" y="10" width="80" height="80" fill="black"/>
+</svg>