fix(deploy): bound readiness sampling for restarted native API environment

Observed main deployment34413017866 at8e08a8f98: restart active22:53:49.210, process environment assertion failed22:53:49.262. At stable runtime the identical root-owned assertion and native callback assertion both PASS, with secrets never printed. This supports a transient startup/exec observation window, not a missing production configuration. Follow-up should use bounded fresh MainPID sampling and retain strict fail-closed value validation; deterministic transient/permanent failure tests required. Current exact deploy job rerun requested without weakening checks. Refs #3234.

Start with the exact deploy job rerun and the readiness checks around the restarted native API environment. Trace the fresh MainPID sampling and strict fail-closed validation, then run or add deterministic transient- and permanent-failure tests; done means transient startup observations no longer fail while permanent invalid values still fail.

Written by the indexing model from the issue text.