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Field signals ts=1784019503 (heartbeat reports 0 frames during 64s browser calibration — reads as broken but is healthy) and ts=1784042064 (1292s Windows render hard-exited during video frame extraction with no final error string — silent worker crash). Add calibrating/capturing state to heartbeat labels; surface synthetic terminal error on unexpected worker exit when no explicit error was emitted. Stack: PR #6 of 9 (base via/overlay-count-lint). Signed-off-by: Via <vance@heygen.com>