Fallback city-card reads now distinguish three cases that previously collapsed into the generic fast-evidence copy: observed highs above the model path, observed highs still lagging after the peak window, and low observations before the peak window that should wait for confirmation rather than down-revise immediately. The same pass removes three unused private helpers from the scan terminal service.
Constraint: Fallback output must be useful before the full AI airport-bulletin read returns
Rejected: Treat any low latest METAR as a down-revision | early-day observations can be below the forecast before the peak window
Rejected: Keep unused helper wrappers | they were unreferenced and added noise to an already large module
Confidence: high
Scope-risk: moderate
Tested: pytest tests/test_web_observability.py -q
Tested: npm run build
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