SHEARLINE v1.0.0

First public release.

• Seven tools: get_active_warnings, get_spc_outlook, get_point_environment,
  get_mrms_severe, get_storm_reports, get_threat_brief, get_radar_snapshot.
• stdio and streamable-HTTP transports (shearline / shearline --http --port 8741).
• No API keys: NWS api.weather.gov, SPC GeoJSON, NOMADS RAP grib filter,
  MRMS + NEXRAD Level 2 on AWS Open Data (anonymous), IEM Local Storm Reports.
• Every tool returns data + interpretation + degraded + safety disclaimer;
  CONUS-only with clear out-of-bounds errors; TTL-cached upstream fetches with
  graceful degradation.
• Environment derivations via MetPy: MLCAPE/MUCAPE/SBCAPE + CINs, LCL, bulk
  shear, SRH, Bunkers motion, effective inflow layer, effective SRH/shear,
  SCP, fixed-layer and effective-layer STP.
• Upstream contracts verified empirically at build time, including the 2026
  SPC cig* significant-severe layer migration (frozen sig* relics guarded),
  the IEM begints+endts requirement, and the NEXRAD bucket move to
  unidata-nexrad-level2.
• Offline test suite against recorded real-weather fixtures; live smoke test
  script for both transports.

See the README for the tool table and an example threat-brief transcript.