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8bf57e8bde
Regression: `costUsageCache` in `src/gateway/server-methods/usage.ts` had no delete/prune/evict path. The TTL check at L310 only gates stale reads — on a miss after expiry, `set()` overwrites the same key but never removes stale keys. `parseDateRange` derives cacheKey from `getTodayStartMs`, so cacheKey rolls at every UTC 00:00, and additional axes (days / startDate / endDate / utcOffset) multiply cardinality. The macOS menu polls `usage.cost` every ~45s with no params, exercising `parseDateRange`'s default branch every day. Over gateway uptime the map grows monotonically. Three sibling caches in the same subsystem already implement MAX + FIFO eviction (resolvedSessionKeyByRunId, TRANSCRIPT_SESSION_KEY_CACHE, sessionTitleFieldsCache). This change mirrors their pattern: - `COST_USAGE_CACHE_MAX = 256` (matches RUN_LOOKUP_CACHE_LIMIT and TRANSCRIPT_SESSION_KEY_CACHE_MAX). - New `setCostUsageCache(cacheKey, entry)` helper checks size + evicts `keys().next().value` when adding a new key would exceed the cap. - The three existing `costUsageCache.set(...)` call sites now route through the helper. TTL-on-read, in-flight dedup, and overwrite-on-same-key semantics are preserved. Adds `src/gateway/server-methods/usage.cost-usage-cache.test.ts` which drives growth through `__test.loadCostUsageSummaryCached` with 600 distinct (startMs, endMs) pairs (mirrors day rollover + range switches). Pre-fix the Map grows to 600; post-fix it plateaus, the last key is retained, and the first key is evicted (FIFO). AI-assisted (fully tested). 432 server-methods tests pass, pnpm check + pnpm build clean.