* fix: preserve debouncing settings for post-preprocessing arg accumulation
After preprocessing completes, store the flow's debouncing settings in
runnable_settings_handle on v2_job_queue so that maybe_apply_debouncing
can find them when the surviving job is pulled. Without this, the handle
is NULL and arg accumulation silently does nothing for flows with
preprocessors.
Also adds a debouncing badge in flow settings and 4 focused accumulation
tests covering scripts, flows without preprocessor, flows with
preprocessor (with and without the fix).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* chore: update sqlx prepared query for worker_flow.rs change
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>