docs: Helix Stadium feature parity audit — full gap analysis vs manual Rev D v1.3

docs/helix-parity-audit.md

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+# Helix Stadium Feature Parity Audit — 2026-06-12
+
+Based on manual Rev D v1.3 at https://manuals.line6.com/en/helix-stadium/live
+
+## ✅ IMPLEMENTED & DEPLOYED
+
+### Signal Path & Blocks
+- Horizontal block chain with IN->OUT signal path
+- SVG icons per block type (38 pipedal icons mapped)
+- Block type labels & display names
+- Bypass LED per block (green=active, dim=bypassed)
+- Drag-to-reorder blocks
+- Parameter panel with sliders & knobs (toggleable)
+- Focus View (full-screen block editor) — in codebase
+- Split/Merge blocks with 4 split types
+- Parallel signal paths with dual-row layout
+- IN/OUT terminators
+
+### Presets
+- Preset sidebar (Bank + 4 programs)
+- Preset loading via POST /api/presets/{bank}/{program}/activate
+- Bank navigation
+- Current preset indicator
+
+### Footswitch Modes
+- Stomp mode — block toggle footswitches
+- Preset mode — bank up/down + preset selection
+- Scribble strips per footswitch
+- Global bypass
+- Mode selector (SM/PR toggle in status bar)
+- Double-tap gesture support
+
+### Tuner
+- Visual tuner with mute
+- Status bar toggle
+
+### Status Bar
+- Connection indicator, CPU, sample rate
+- Master volume, routing mode, preset name
+- Tuner badge, mode selector
+- Captures/Presets view buttons
+- Fullscreen toggle
+
+### UI Design
+- Dark theme, Helix-inspired layout
+- Large touch targets, landscape
+- Custom SVG icons
+- Fullscreen mode
+
+## ⚠️ PARTIALLY IMPLEMENTED
+
+### Snapshots
+- SnapshotPanel reference extracted (docs/snapshot-reference.jsx)
+- Snapshot mode in TS reference project
+- NOT wired into main JSX UI
+- No snapshot footswitch mode in FootswitchBar
+- No snapshot bypass toggle or per-parameter control
+
+### Model Browser
+- Currently being built by coder (running)
+
+## ❌ NOT IMPLEMENTED
+
+### P3: Undo/Redo + Menu + Global Settings (todo)
+- Undo/Redo for block operations
+- Main menu (New Preset, Save, Command Center, etc.)
+- Global Settings UI
+- Global EQ
+- Save preset
+
+### P3: Looper (todo)
+- Record/Play/Overdub/Stop
+
+### Block Action Panel
+- Copy/Paste/Clear blocks
+- User/Factory Defaults
+- Snapshot Bypass toggle
+- Assign to footswitch
+
+### Command Center (MIDI)
+- MIDI CC/Note/Program
+- Ext amp switching, Hotkeys
+- Instant commands, Dual-command
+
+### Song View
+- Setlist management
+- Per-song presets
+
+### Other
+- Drag off-screen delete
+- Block copy/paste cross-preset
+- Parameter page swipe (8+ params)
+- Favorites, User Defaults
+- Tempo control
+- Preset save with naming
+- Discard Edits toggle
+- MIDI recall info