Add resilient handover, live LED layout refresh and TV calibration profiles

profiles/README.md

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+# TV model calibration profiles
+
+The built-in LG G4 profile is measured. Other models do not have verified spatial
+profiles yet. Auto uses uniform average colors on an unknown model, unless an
+imported custom profile matches its exact reported model identifier.
+
+To import measured data, select Custom in the TV app, paste the profile JSON,
+and select Save profile. Auto subsequently uses the custom profile on that exact
+model. One custom model profile is stored in the own service container. Importing
+another replaces it; switching to Auto, G4 or Average preserves the imported data.
+
+```json
+{
+  "model": "EXACT-MODEL-IDENTIFIER-FROM-APP",
+  "points": [
+    {"position": 0.25, "region": 7},
+    {"position": 2.25, "region": 9}
+  ]
+}
+```
+
+This two-point example describes the file format, not a calibrated TV model.
+Use 2-16 actual measured points sorted by position. Region indices are 0-15.
+The clockwise perimeter position starts at the top-left corner: top 0-1, right
+1-2, bottom 2-3, left 3-4. The final point interpolates back to the first.
+
+Use the coordinate-ramp calibration video with full-screen playback, observe
+the LG histogram region colors, and derive their measured perimeter positions.
+Validate all four edges against the receiver LED output before sharing a model
+profile. A model match alone does not establish correctness on another panel,
+SoC or firmware; document that test context with contributed profiles.
+
+Profiles only control spatial region assignment. Saturation, brightness and
+smoothing remain receiver settings. Runtime selection invalidates the generated
+HyperHDR geometry and refreshes the Hyperion LED mapping without capture restart.