Reduce memoization TTL to 1 minute and cache cleanup interval to 30s

[Copilot]

Memoization lifetime was too long and cache cleanup ran too infrequently, increasing memory pressure and staleness window in the grouper worker.

Changes

• MEMOIZATION_TTL: 600_000 ms → 60_000 ms (10 min → 1 min)
• Cache cleanup interval: 5 minutes → 30 seconds — renamed constant to CACHE_CLEANUP_INTERVAL_SECONDS = 30, switched multiplier to TimeMs.SECOND

// Before
const MEMOIZATION_TTL = 600_000;
const CACHE_CLEANUP_INTERVAL_MINUTES = 5;
// ...
}, CACHE_CLEANUP_INTERVAL_MINUTES * TimeMs.MINUTE);

// After
const MEMOIZATION_TTL = 60_000;
const CACHE_CLEANUP_INTERVAL_SECONDS = 30;
// ...
}, CACHE_CLEANUP_INTERVAL_SECONDS * TimeMs.SECOND);

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[neSpecc]

@copilot decrease MEMOIZATION_TTL to 1 minute

[Copilot]

@copilot decrease MEMOIZATION_TTL to 1 minute

Done — MEMOIZATION_TTL is now 60_000 ms (1 minute) in commit 590749e.

[codex-assistant]

Thanks for adding a description — the PR is now marked as Ready for Review.

[codex-assistant]

Thanks for adding a description — the PR is now marked as Ready for Review.

[codex-assistant]

Thanks for adding a description — the PR is now marked as Ready for Review.