docs: changelog for v0.2.0

CHANGELOG.md

@@ -0,0 +1,35 @@
+# Changelog
+
+## v0.2.0 — Phase 1a (2026-05-16)
+
+Three live data sources, configurable infrastructure, hot-reload
+everywhere.
+
+### Added
+- FIRMS fire hotspot adapter (VIIRS_SNPP_NRT + VIIRS_NOAA20_NRT)
+- USGS earthquake adapter (GeoJSON feed)
+- Operational config in Postgres `config` schema
+  (adapters, api_keys, streams) with LISTEN/NOTIFY hot-reload
+- Per-stream retention management (config.streams)
+  with supervisor-managed max_bytes auto-tuning
+- Unified region selection (bbox) across all adapters
+- Adapter registry pattern for one-line addition of new sources
+- `apply_config()` per-adapter for generic hot-reload of settings
+
+### Changed
+- NWS adapter migrated from `states` list to bbox region filter
+- Polygon-vs-bbox intersection (shapely) replaces centroid filter
+- CloudEvents protocol constants moved from operational config
+  to code constants
+- Operational config retired from `central.toml` to Postgres
+  (`config.adapters`, `config.api_keys`); TOML removed
+
+### Fixed
+- Cadence-decrease hot-reload (AsyncLimiter inside NWS adapter
+  removed; supervisor is single owner of cadence)
+- `last_completed_poll` preserved across adapter enable/disable
+  cycles to honor the rate-limit guarantee
+
+### Infrastructure
+- CENTRAL_FIRE stream (7d default retention)
+- CENTRAL_QUAKE stream (7d default retention)