Sub-Agent TTL Binary Cutover Pattern

Description

Silent-rollout pattern fingerprint distinguishing server-side policy flip from all other explanations: a single-day binary transition (68% -> 0% 1h on adjacent days) across normal-range call volume with no client version change and a role-specific scope. Four diagnostic properties collectively rule out client version change, quota-triggered downgrade, and workflow change — leaving a server-side role-targeted flip as the only consistent explanation.

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Sources

src-20260419-392eceac3ff7