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.

tests/test_crop_effect.py

@@ -0,0 +1,99 @@
+"""
+Tests for CropEffect.
+"""
+
+from engine.effects.plugins.crop import CropEffect
+from engine.effects.types import EffectContext
+
+
+def make_ctx(terminal_width: int = 80, terminal_height: int = 24) -> EffectContext:
+    """Create a mock EffectContext."""
+    return EffectContext(
+        terminal_width=terminal_width,
+        terminal_height=terminal_height,
+        scroll_cam=0,
+        ticker_height=terminal_height,
+    )
+
+
+class TestCropEffect:
+    """Tests for CropEffect."""
+
+    def test_basic_init(self):
+        """CropEffect initializes with defaults."""
+        effect = CropEffect()
+        assert effect.name == "crop"
+        assert effect.config.enabled is True
+
+    def test_crop_wider_buffer(self):
+        """CropEffect crops wide buffer to terminal width."""
+        effect = CropEffect()
+        buf = [
+            "This is a very long line that exceeds the terminal width of eighty characters!",
+            "Another long line that should also be cropped to fit within the terminal bounds!",
+            "Short",
+        ]
+        ctx = make_ctx(terminal_width=40, terminal_height=10)
+
+        result = effect.process(buf, ctx)
+
+        # Lines should be cropped to 40 chars
+        assert len(result[0]) == 40
+        assert len(result[1]) == 40
+        assert result[2] == "Short" + " " * 35  # padded to width
+
+    def test_crop_taller_buffer(self):
+        """CropEffect crops tall buffer to terminal height."""
+        effect = CropEffect()
+        buf = ["line"] * 30  # 30 lines
+        ctx = make_ctx(terminal_width=80, terminal_height=10)
+
+        result = effect.process(buf, ctx)
+
+        # Should be cropped to 10 lines
+        assert len(result) == 10
+
+    def test_pad_shorter_lines(self):
+        """CropEffect pads lines shorter than width."""
+        effect = CropEffect()
+        buf = ["short", "medium length", ""]
+        ctx = make_ctx(terminal_width=20, terminal_height=5)
+
+        result = effect.process(buf, ctx)
+
+        assert len(result[0]) == 20  # padded
+        assert len(result[1]) == 20  # padded
+        assert len(result[2]) == 20  # padded (was empty)
+
+    def test_pad_to_height(self):
+        """CropEffect pads with empty lines if buffer is too short."""
+        effect = CropEffect()
+        buf = ["line1", "line2"]
+        ctx = make_ctx(terminal_width=20, terminal_height=10)
+
+        result = effect.process(buf, ctx)
+
+        # Should have 10 lines
+        assert len(result) == 10
+        # Last 8 should be empty padding
+        for i in range(2, 10):
+            assert result[i] == " " * 20
+
+    def test_empty_buffer(self):
+        """CropEffect handles empty buffer."""
+        effect = CropEffect()
+        ctx = make_ctx()
+
+        result = effect.process([], ctx)
+
+        assert result == []
+
+    def test_uses_context_dimensions(self):
+        """CropEffect uses context terminal_width/terminal_height."""
+        effect = CropEffect()
+        buf = ["x" * 100]
+        ctx = make_ctx(terminal_width=50, terminal_height=1)
+
+        result = effect.process(buf, ctx)
+
+        assert len(result[0]) == 50