Fixes#2, #3, #4
Issue #2 - Silent database errors in updateSpan():
- Add error handling for telemetry INSERT (ERR-TELEMETRY-004)
- Add error handling for all table/index creation (ERR-TELEMETRY-005 to -010)
- Return HTTP 500 to client on insert failure
Issue #3 - Silent failure in Kuma push:
- Return early on non-OK status from Kuma
- Proper error logging with body close handling
Issue #4 - Unchecked flush error in tarpit:
- Verify http.Flusher available before tarpit
- Log ERR-TELEMETRY-040 and abort if flusher unavailable
- Remove redundant flusher checks in loop
All changes: security failures are now LOUD (Cardinal Rule #1)
Author: Hans <hans-20250409-001>
b4aced5c03