The launch script now starts merge_drive by default (T5-7: it is the
controller's singleton merge stage — APPROVED -> MERGING -> MERGED).
Previously the script killed merge_drive as a "legacy" process but
never started it, so controller workflows dead-ended at APPROVED.
merge_drive moves into the CONTROLLER process group; --no-merge skips
it. Also adds the worker thread-pool concurrency knob (default 2 for
the trial harness).
Renames the misleadingly-named env var
CONTROLLER_MAX_CONCURRENT_WORKERS_PER_MACHINE ->
CONTROLLER_MAX_CONCURRENT_WORKER_THREADS_PER_MACHINE: it sizes a
ThreadPoolExecutor inside one worker process, it does not spawn
worker processes.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
drew
f454670a0e