- Station ID validation (7-digit regex) prevents path traversal
- Stale cache fallback: serve expired data if refresh fails
- Resilient startup: server starts even if NOAA is down
- Contextual HTTP error messages with recovery hints
- Hours range validation (1-720)
- find_nearest limit/distance validation
- search() and find_nearest() now async with cache TTL checks
- Better error type info in conditions snapshot partial failures
7 tools: station search/nearest/info, tide predictions/observations,
meteorological data (Literal selector for 8 products), and parallel
marine conditions snapshot. 3 resources, 2 prompts, full test suite.
