llm_calls gains a nullable stream_end TEXT column (auto backfill,
manual-mode trimming as in 1.3.8). TelemetryRecorder.record_llm_call
takes a new required keyword stream_end; the emitter reads it from the
response on attempt rows and writes NULL for failed, cache-hit and
terminal rows.
Red: 18 tests in tests/unit/test_telemetry.py and test_ports.py failed
against the pre-change source (missing column, 38-field signature,
stream_end absent from emitted rows).
iomgaa
779a9b29a3