fix(edge): meter and size-cap knowledge embeddings in embed-chunks and search-knowledge

server/supabase/functions/_shared/embedding-quota.fake.ts

@@ -0,0 +1,25 @@
+// Test double for EmbeddingUsageStore (not a test file itself).
+import { EMBEDDING_QUOTA_FEATURE, type EmbeddingUsageStore } from './embedding-quota.ts'
+import type { PlanQuotaTier } from './core-contract.generated.ts'
+
+/** In-memory daily_usage keyed by date; `today` is the date increments land on. */
+export class MemoryUsageStore implements EmbeddingUsageStore {
+  rows = new Map<string, number>()
+  failIncrement = false
+  constructor(public tier: PlanQuotaTier, public today: string) {}
+  readTier(): Promise<PlanQuotaTier> {
+    return Promise.resolve(this.tier)
+  }
+  increment(_userId: string, feature: string, amount: number): Promise<number> {
+    if (this.failIncrement) return Promise.reject(new Error('down'))
+    if (feature !== EMBEDDING_QUOTA_FEATURE) return Promise.reject(new Error(`unexpected feature ${feature}`))
+    const next = (this.rows.get(this.today) ?? 0) + amount
+    this.rows.set(this.today, next)
+    return Promise.resolve(next)
+  }
+  sumBetween(_userId: string, _feature: string, fromDate: string, beforeDate: string): Promise<number> {
+    let sum = 0
+    for (const [date, count] of this.rows) if (date >= fromDate && date < beforeDate) sum += count
+    return Promise.resolve(sum)
+  }
+}