feat: add pre-compaction memory flush

src/agents/pi-settings.ts

@@ -1,3 +1,5 @@
+import type { ClawdbotConfig } from "../config/config.js";
+
 export const DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR = 20_000;
 
 type PiSettingsManagerLike = {
@@ -25,3 +27,13 @@ export function ensurePiCompactionReserveTokens(params: {
 
   return { didOverride: true, reserveTokens: minReserveTokens };
 }
+
+export function resolveCompactionReserveTokensFloor(
+  cfg?: ClawdbotConfig,
+): number {
+  const raw = cfg?.agents?.defaults?.compaction?.reserveTokensFloor;
+  if (typeof raw === "number" && Number.isFinite(raw) && raw >= 0) {
+    return Math.floor(raw);
+  }
+  return DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR;
+}