feat(integration): Complete feature rewrite with pipeline architecture, effects system, and display improvements

Major changes:
- Pipeline architecture with capability-based dependency resolution
- Effects plugin system with performance monitoring
- Display abstraction with multiple backends (terminal, null, websocket)
- Camera system for viewport scrolling
- Sensor framework for real-time input
- Command-and-control system via ntfy
- WebSocket display backend for browser clients
- Comprehensive test suite and documentation

Issue #48: ADR for preset scripting language included

This commit consolidates 110 individual commits into a single
feature integration that can be reviewed and tested before
further refinement.

engine/pipeline/adapters/display.py

@@ -0,0 +1,93 @@
+"""Adapter wrapping Display as a Stage."""
+
+from typing import Any
+
+from engine.pipeline.core import PipelineContext, Stage
+
+
+class DisplayStage(Stage):
+    """Adapter wrapping Display as a Stage."""
+
+    def __init__(self, display, name: str = "terminal"):
+        self._display = display
+        self.name = name
+        self.category = "display"
+        self.optional = False
+        self._initialized = False
+        self._init_width = 80
+        self._init_height = 24
+
+    def save_state(self) -> dict[str, Any]:
+        """Save display state for restoration after pipeline rebuild.
+
+        Returns:
+            Dictionary containing display state that can be restored
+        """
+        return {
+            "initialized": self._initialized,
+            "init_width": self._init_width,
+            "init_height": self._init_height,
+            "width": getattr(self._display, "width", 80),
+            "height": getattr(self._display, "height", 24),
+        }
+
+    def restore_state(self, state: dict[str, Any]) -> None:
+        """Restore display state from saved state.
+
+        Args:
+            state: Dictionary containing display state from save_state()
+        """
+        self._initialized = state.get("initialized", False)
+        self._init_width = state.get("init_width", 80)
+        self._init_height = state.get("init_height", 24)
+
+        # Restore display dimensions if the display supports it
+        if hasattr(self._display, "width"):
+            self._display.width = state.get("width", 80)
+        if hasattr(self._display, "height"):
+            self._display.height = state.get("height", 24)
+
+    @property
+    def capabilities(self) -> set[str]:
+        return {"display.output"}
+
+    @property
+    def dependencies(self) -> set[str]:
+        return {"render.output"}  # Display needs rendered content
+
+    @property
+    def inlet_types(self) -> set:
+        from engine.pipeline.core import DataType
+
+        return {DataType.TEXT_BUFFER}  # Display consumes rendered text
+
+    @property
+    def outlet_types(self) -> set:
+        from engine.pipeline.core import DataType
+
+        return {DataType.NONE}  # Display is a terminal stage (no output)
+
+    def init(self, ctx: PipelineContext) -> bool:
+        w = ctx.params.viewport_width if ctx.params else 80
+        h = ctx.params.viewport_height if ctx.params else 24
+
+        # Try to reuse display if already initialized
+        reuse = self._initialized
+        result = self._display.init(w, h, reuse=reuse)
+
+        # Update initialization state
+        if result is not False:
+            self._initialized = True
+            self._init_width = w
+            self._init_height = h
+
+        return result is not False
+
+    def process(self, data: Any, ctx: PipelineContext) -> Any:
+        """Output data to display."""
+        if data is not None:
+            self._display.show(data)
+        return data
+
+    def cleanup(self) -> None:
+        self._display.cleanup()