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js_repl_reset previously raced with in-flight/new js_repl executions because reset() could clear exec_tool_calls without synchronizing with execute(). In that window, a running exec could lose its per-exec tool-call context, and subsequent kernel RunTool messages would fail with js_repl exec context not found. The fix serializes reset and execute on the same exec_lock, so reset cannot run concurrently with exec setup/teardown. We also keep the timeout path safe by performing reset steps inline while execute() already holds the lock, avoiding re-entrant lock acquisition. A regression test now verifies that reset waits for the exec lock and does not clear tool-call state early.