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.

presets.toml

@@ -0,0 +1,125 @@
+# Mainline Presets Configuration
+# Human- and machine-readable preset definitions
+#
+# Format: TOML
+# Usage: mainline --preset <name>
+#
+# Built-in presets can be overridden by user presets in:
+#   - ~/.config/mainline/presets.toml
+#   - ./presets.toml (local override)
+
+# ============================================
+# TEST PRESETS (for CI and development)
+# ============================================
+
+[presets.test-basic]
+description = "Test: Basic pipeline with no effects"
+source = "empty"
+display = "null"
+camera = "feed"
+effects = []
+viewport_width = 100  # Custom size for testing
+viewport_height = 30
+
+[presets.test-border]
+description = "Test: Single item with border effect"
+source = "empty"
+display = "null"
+camera = "feed"
+effects = ["border"]
+viewport_width = 80
+viewport_height = 24
+
+[presets.test-scroll-camera]
+description = "Test: Scrolling camera movement"
+source = "empty"
+display = "null"
+camera = "scroll"
+effects = []
+camera_speed = 0.5
+viewport_width = 80
+viewport_height = 24
+
+# ============================================
+# DEMO PRESETS (for demonstration and exploration)
+# ============================================
+
+[presets.demo-base]
+description = "Demo: Base preset for effect hot-swapping"
+source = "headlines"
+display = "terminal"
+camera = "feed"
+effects = []  # Demo script will add/remove effects dynamically
+camera_speed = 0.1
+viewport_width = 80
+viewport_height = 24
+
+[presets.demo-pygame]
+description = "Demo: Pygame display version"
+source = "headlines"
+display = "pygame"
+camera = "feed"
+effects = []  # Demo script will add/remove effects dynamically
+camera_speed = 0.1
+viewport_width = 80
+viewport_height = 24
+
+[presets.demo-camera-showcase]
+description = "Demo: Camera mode showcase"
+source = "headlines"
+display = "terminal"
+camera = "feed"
+effects = []  # Demo script will cycle through camera modes
+camera_speed = 0.5
+viewport_width = 80
+viewport_height = 24
+
+# ============================================
+# SENSOR CONFIGURATION
+# ============================================
+
+[sensors.mic]
+enabled = false
+threshold_db = 50.0
+
+[sensors.oscillator]
+enabled = true  # Enable for demo script gentle oscillation
+waveform = "sine"
+frequency = 0.05  # ~20 second cycle (gentle)
+amplitude = 0.5   # 50% modulation
+
+# ============================================
+# EFFECT CONFIGURATIONS
+# ============================================
+
+[effect_configs.noise]
+enabled = true
+intensity = 1.0
+
+[effect_configs.fade]
+enabled = true
+intensity = 1.0
+
+[effect_configs.glitch]
+enabled = true
+intensity = 0.5
+
+[effect_configs.firehose]
+enabled = true
+intensity = 1.0
+
+[effect_configs.hud]
+enabled = true
+intensity = 1.0
+
+[effect_configs.tint]
+enabled = true
+intensity = 1.0
+
+[effect_configs.border]
+enabled = true
+intensity = 1.0
+
+[effect_configs.crop]
+enabled = true
+intensity = 1.0