* fix(agent-core): always pair tool.call with tool.result on malformed returns
A tool returning undefined, a primitive, or an object without a valid
output field crashed normalization, exited the batch loop without
dispatching the matching tool.result, and left the next provider
request to fail with a missing tool_call_id response.
- Validate the tool return at the boundary in runRunnableToolCall via a
new coerceToolResult helper; malformed returns become an isError
result.
- Harden normalizeToolResult and toolResultStopsTurn against
non-conformant input from synthetic results or finalize hooks.
- Track unpaired tool.call ids in runToolCallBatch and emit
compensating error results in finally for any that did not receive a
result.
* refactor(agent-core): simplify tool result pairing
Drop the unpairedCallIds tracking and finally-compensation wrapper from
runToolCallBatch. The set was updated before dispatchEvent, so a failure
between the two left it inconsistent; the per-call try/catch already
produces a paired error result, making the outer wrapper redundant.
Coerce hook returns at the synthetic and finalizeToolResult boundaries
so a malformed hook output is normalized into a paired error result the
same way a malformed tool return already is.
