docs(05): capture phase context

.planning/phases/05-live-show-execution/05-DISCUSSION-LOG.md

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+# Phase 5: Live Show Execution - Discussion Log
+
+> **Audit trail only.** Do not use as input to planning, research, or execution agents.
+> Decisions are captured in CONTEXT.md — this log preserves the alternatives considered.
+
+**Date:** 2026-04-07
+**Phase:** 05-live-show-execution
+**Areas discussed:** Cue Scheduler Location, Live Preview Panel
+
+---
+
+## Cue Scheduler Location
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Server decides | Extend ws.py tick handler — server scans cues and calls UDPSender.send() | ✓ |
+| Browser decides | Browser tracks blocks, sends fire_cue messages to server as relay | |
+
+**User's choice:** Server decides
+
+---
+
+### Timing Window
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| 60ms look-ahead window | Fire if block starts within 60ms of current tick position — never miss a cue | ✓ |
+| Exact match + tolerance | ±20ms window — more precise but may miss cues between ticks | |
+
+**User's choice:** 60ms look-ahead window
+
+---
+
+## Live Preview Panel
+
+### What to show
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Animation color + type per device | Solid strip per device showing active animation and color | ✓ |
+| Per-LED simulation | Actual animated frame-by-frame rendering (complex, needs backend or JS reimplement) | |
+
+**User's choice:** Animation color + type per device
+
+---
+
+### Panel placement
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Below timeline, above transport bar | Horizontal strip always visible during playback | ✓ |
+| Sidebar panel | Right sidebar alongside devices — less vertical space | |
+
+**User's choice:** Below timeline, above transport bar
+
+---
+
+## Claude's Discretion
+
+- Keyboard shortcuts (UI-03) — standard DAW conventions (Space, arrows, Ctrl+Z/S)
+- Show save/load UX — auto-save already exists via CRUD; Ctrl+S as explicit save shortcut
+- Preview panel height — compact, 40-60px, one row per device
+
+## Deferred Ideas
+
+- Per-LED frame simulation — v2
+- Standalone fullscreen preview mode — out of scope
+- Keyboard shortcut customization UI — out of scope for v1