feat: add cache-ttl pruning mode

src/agents/pi-embedded-runner/cache-ttl.ts

@@ -0,0 +1,52 @@
+type CustomEntryLike = { type?: unknown; customType?: unknown; data?: unknown };
+
+export const CACHE_TTL_CUSTOM_TYPE = "clawdbot.cache-ttl";
+
+export type CacheTtlEntryData = {
+  timestamp: number;
+  provider?: string;
+  modelId?: string;
+};
+
+export function isCacheTtlEligibleProvider(provider: string, modelId: string): boolean {
+  const normalizedProvider = provider.toLowerCase();
+  const normalizedModelId = modelId.toLowerCase();
+  if (normalizedProvider === "anthropic") return true;
+  if (normalizedProvider === "openrouter" && normalizedModelId.startsWith("anthropic/"))
+    return true;
+  return false;
+}
+
+export function readLastCacheTtlTimestamp(sessionManager: unknown): number | null {
+  const sm = sessionManager as { getEntries?: () => CustomEntryLike[] };
+  if (!sm?.getEntries) return null;
+  try {
+    const entries = sm.getEntries();
+    let last: number | null = null;
+    for (let i = entries.length - 1; i >= 0; i--) {
+      const entry = entries[i];
+      if (entry?.type !== "custom" || entry?.customType !== CACHE_TTL_CUSTOM_TYPE) continue;
+      const data = entry?.data as Partial<CacheTtlEntryData> | undefined;
+      const ts = typeof data?.timestamp === "number" ? data.timestamp : null;
+      if (ts && Number.isFinite(ts)) {
+        last = ts;
+        break;
+      }
+    }
+    return last;
+  } catch {
+    return null;
+  }
+}
+
+export function appendCacheTtlTimestamp(sessionManager: unknown, data: CacheTtlEntryData): void {
+  const sm = sessionManager as {
+    appendCustomEntry?: (customType: string, data: unknown) => void;
+  };
+  if (!sm?.appendCustomEntry) return;
+  try {
+    sm.appendCustomEntry(CACHE_TTL_CUSTOM_TYPE, data);
+  } catch {
+    // ignore persistence failures
+  }
+}