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0efc5d538e
The compat bridge produces InvalidToolCallBlock when tool-call JSON parse
fails, but ChatModelStream had no handler for it. The finish event was
silently ignored, the stale chunk stayed in _tool_call_chunks, and
_finish's sweep re-parsed (failed again), fell back to args={}, and
appended a valid-looking ToolCallBlock — so the protocol said "invalid"
while the assembled AIMessage said "valid with empty args". An agent layer
downstream could then dispatch the malformed call.
The finish handler now routes invalid_tool_call blocks into
_invalid_tool_calls_acc and deletes the stale chunk entry; _finish's sweep
emits InvalidToolCallBlock on JSON failure instead of an empty-args tool
call; _assemble_message passes invalid_tool_calls through to AIMessage.