Add Infinity_Vis_1 performance core

Infinity_Vis_1/MIGRATION_STATUS.md

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+# Infinity_Vis_1 Migration Status
+
+This file tracks the legacy feature surface against the clean rebuild so we can
+rebuild deliberately instead of drifting into another tangled codebase.
+
+## Core runtime
+
+| Feature | Legacy app | Infinity_Vis_1 |
+| --- | --- | --- |
+| XML mapping load/save | Yes | Yes |
+| Mapping validation | Yes | Yes |
+| Shared-IP controller grouping | Yes | Yes |
+| Tile-color pattern render path | Yes | Yes |
+| Direct DDP payload generation | Yes | Yes |
+| Output/preview timing split | Partial | Yes |
+| Delta sending with keepalive | Partial | Yes |
+| Benchmark tooling | Partial | Yes |
+
+## Patterns
+
+| Pattern | Legacy app | Infinity_Vis_1 |
+| --- | --- | --- |
+| solid | Yes | Yes |
+| checker | Yes | Yes |
+| row_gradient | Yes | Yes |
+| column_gradient | Yes | Yes |
+| center_pulse | Yes | Yes |
+| sparkle | Yes | Yes |
+| breathing | Yes | Yes |
+| wave_line | Yes | Yes |
+| scan | Yes | Yes |
+| arrow | Yes | Yes |
+| scan_dual | Yes | Yes |
+| sweep | Yes | Yes |
+| saw | Yes | Yes |
+| two_dots | Yes | Yes |
+| strobe | Yes | Yes |
+| stopwatch | Yes | Yes |
+| snake | Yes | Yes |
+
+## Presets and project data
+
+| Feature | Legacy app | Infinity_Vis_1 |
+| --- | --- | --- |
+| JSON preset storage | Yes | Yes |
+| Project scene state | Yes | Yes |
+| Controller metadata persistence | Yes | Yes |
+| WLED mapping metadata in XML | Yes | Yes |
+
+## UI and operator workflow
+
+| Feature | Legacy app | Infinity_Vis_1 |
+| --- | --- | --- |
+| Desktop Qt main window | Yes | Not yet |
+| Full preview painter | Yes | Not yet |
+| FOH Go/Fade Go workflow | Yes | Not yet |
+| Preset browser UI | Yes | Not yet |
+| Selected tile tools | Yes | Not yet |
+| Mapping Settings dialog | Yes | Not yet |
+| WLED assisted mapping UI | Yes | Not yet |
+| Output diagnostics panel | Yes | Not yet |
+
+## Phase order
+
+1. Prove the faster core with tests and benchmarks.
+2. Rebuild scene transport and operator workflows on top of the new engine.
+3. Rebuild the desktop UI as a thin shell over the new runtime instead of the old state-heavy controller loop.