Baseline can now come from fixed values typed per location, not just captured
data — for a spec limit ("L10 = 85") or a prior report's averages when the raw
data isn't available.
- SoundReportConfig.baseline_mode ("captured" | "reference").
- report_pipeline: _location_reference_baseline() reads per-location values from
location_metadata; build_*_night_report honor baseline_mode (reference cells
use the typed value; unset metrics compare against nothing).
- reports router: GET/PUT /reports/baseline (mode on config + per-location values
in location_metadata); config carries baseline_mode; manual view/run fall back
to the saved config's baseline when no explicit dates are given.
- orchestrator + scheduler tick thread baseline_mode through.
Verified end-to-end: PUT/GET /baseline, reference deltas (L10 66.6 vs 85 -> -18.4),
unset metrics compare against nothing, captured-mode regression intact.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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