Sync: Complete project state with all MEGA SPRINT V1-V3 features and Codex stubs

.cursorrules

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+You are working in the AbletonMCP-AI repository on Windows.
+
+Read `AGENTS.md` and `CLAUDE.md` before making substantial edits.
+
+Current priorities:
+- manual workflow, not blind autopilot
+- editing open Ableton projects, especially `C:\Users\ren\Desktop\song Project\song.als`
+- stronger coherence and continuity
+- fewer silent gaps and less visual/audio symmetry
+- harmonic MIDI backbone across the arrangement
+- no automatic vocals
+
+Execution rules:
+- use PowerShell, not bash
+- use absolute Windows paths when scripting
+- compile changed Python files before claiming success
+- run targeted tests when possible
+- validate with MCP/Live runtime when the task touches generation or project editing
+
+Do not:
+- declare success from docs alone
+- patch dead or backup files before active entrypoints
+- force piano timbre just because the task mentions harmonic MIDI or piano roll
+- treat a manifest as the only source of truth
+
+Prefer:
+- small, reviewable patches
+- explicit error handling and structured logging
+- keeping Live mutations short
+- adding or preserving toolability for project inspection and editing