Added
- `next/` segment-display port: 11 LED styles (AX120, PA120, AK120, LC1, LF8, LF12, LF10, CZ1, LC2, LF11, LF15) ported verbatim from legacy `core/led_segment.py` to `next/services/led_segment.py` (~700 LOC). Uses a `LegacyMetricsView` adapter that exposes next/'s `dict[str, SensorReading]` via legacy attribute names through `getattr`, so the segment math copies across without touching the compute layer.
- Pure Python — runs identically on Linux/Windows/macOS/BSD. No legacy or shipping behaviour changed; this only fills a gap in the experimental `TRCC_NEXT=1` build (Phase A3 of the next/ migration plan).