Keep pooled affinity through the extended cache interval

[bb-slop-cop]

🚨 SLOP COP 🚨 · new-issue-autopilot

Human comments

What was wrong

The Account Pooler enables the one-hour Claude prompt-cache setting for subscription routing but expires live and persisted session-account affinity after 30 idle minutes. When another conversation advances the pool cursor, a recovered account's original session can resume on a different account during the cache interval, including after a plugin reload. Verified reproduction and root-cause report.

What changed

Extend the existing idle affinity TTL to 65 minutes: one hour plus a five-minute margin. Add routing regressions at 45 and 61 idle minutes, with and without a full plugin reload. Advance existing Claude/Codex and parent-affinity expiry checks to the new retention window. Eligibility, account failover, cursor behavior, and affinity capacity remain unchanged. No dependency, schema, stored-data, generated-file, public API, protocol, CLI, or release change.

Changed-line count: 79 total text lines (74 additions + 5 deletions) across 2 files in the Account Pooler subsystem.

How you verified

• The test-only regression patch fails on trusted origin/main commit d474d2932dea14b5ccdfa305760c547c03a4d251: all four cases expect the first account but receive the second. The same agent repeated this failure in a second clean checkout with fresh fixture storage.
• pnpm exec turbo run test --filter=bb-plugin-account-pool -- --testNamePattern='retains Claude session affinity': four cases pass after the fix.
• pnpm exec turbo run test typecheck lint --filter=bb-plugin-account-pool: all 353 tests pass; typecheck and lint succeed. Two existing lint warnings also occur on unchanged production code.
• Frozen installs and full Turbo builds succeed in both trusted checkouts. git diff --check and formatting checks pass; the diff contains no binary files.
• The reproduction observes real plugin routing with a synthetic upstream. No live provider cache writes or billing were measured.

Fixes #5262

AGENT GENERATED