histogram_codec: drop _MAX_PEAK_COUNT 4096 → 2200. The old ceiling
let extension-byte blocks slip through at up to 20.48 in/s per
channel, producing 35× inflated PVS sums when first deployed to
prod. 2200 covers Normal-range full-scale (10 in/s = 2000 counts)
plus 10% headroom for quantization edge cases.
backfill_sidecars: also preserve the bw_report block alongside
review + extensions when regenerating sidecars. event_to_sidecar_dict
takes a BwAsciiReport dataclass not a dict, so for bw_report we
overlay the existing block after regen rather than passing as a kwarg.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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