Stage 6 follow-up Obs 1: the hard-coded
SAFE_VISIBILITY_VS_EXEC_BUDGET_SECS = 300 didn't follow
PICLOUD_DISPATCHER_ASYNC_EXEC_TIMEOUT_SEC. A deploy that raised the
executor budget produced false-positive warns; a deploy that lowered
it missed real visibility races.
Refactor validate_queue_visibility_timeout to take safe_limit_secs as
an explicit parameter. The call site reads the live env-overridable
value via safe_visibility_vs_exec_budget_secs() each call; unit tests
inject the boundary directly without touching global env state. New
test safe_limit_threshold_tracks_caller_value asserts both
budget-raised and budget-lowered code paths.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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