Tool call events between assistant messages were invisible in [Stream]
debug output, making it hard to understand message finalization timing.
- Add sawNonAssistantSinceLastUuid tracking to warn when assistant UUID
changes with no visible tool_call/reasoning events in between
- Replace [Bot] tool logging with [Stream]-prefixed structured summaries
(>>> TOOL CALL, <<< TOOL RESULT) for greppable output
- Bridge DEBUG=1 to DEBUG_SDK=1 so SDK-level dropped wire messages are
visible when debugging
Written by Cameron ◯ Letta Code
"The stream does not resist the rock; it flows around it, revealing its shape." -- Unknown
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