Software-only show-control readiness baseline

docs/legacy_xml_reference.md

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+# Legacy XML Reference
+
+Source reviewed:
+
+- `c:\Users\janni\Nextcloud\Documents\Infinity Vis\sample_data\infinity_mirror_mapping_clean.xml`
+
+Useful facts extracted from the legacy file:
+
+- 3 rows by 6 columns logical preview layout
+- 18 total tiles
+- 106 LEDs per tile
+- legacy transport metadata mentions WLED, Art-Net, and per-tile IP addresses
+- each tile is described as four perimeter segments summing to 106 LEDs
+
+What this file is **not** used for:
+
+- it is not the new hardware-mapping schema
+- it is not proof of the final ESP32 node-to-panel assignment
+- it does not validate `UART 6`, `UART 5`, or `UART 4`
+- it should not be imported as a generic slice engine
+
+Recommended use:
+
+- use it as a preview and spatial-reference aid only
+- manually transfer final room layout after the new hardware mapping is physically validated
+