feat: add pre-compaction memory flush

src/agents/pi-settings.test.ts

@@ -3,6 +3,7 @@ import { describe, expect, it, vi } from "vitest";
 import {
   DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR,
   ensurePiCompactionReserveTokens,
+  resolveCompactionReserveTokensFloor,
 } from "./pi-settings.js";
 
 describe("ensurePiCompactionReserveTokens", () => {
@@ -35,3 +36,24 @@ describe("ensurePiCompactionReserveTokens", () => {
     expect(settingsManager.applyOverrides).not.toHaveBeenCalled();
   });
 });
+
+describe("resolveCompactionReserveTokensFloor", () => {
+  it("returns the default when config is missing", () => {
+    expect(resolveCompactionReserveTokensFloor()).toBe(
+      DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR,
+    );
+  });
+
+  it("accepts configured floors, including zero", () => {
+    expect(
+      resolveCompactionReserveTokensFloor({
+        agents: { defaults: { compaction: { reserveTokensFloor: 24_000 } } },
+      }),
+    ).toBe(24_000);
+    expect(
+      resolveCompactionReserveTokensFloor({
+        agents: { defaults: { compaction: { reserveTokensFloor: 0 } } },
+      }),
+    ).toBe(0);
+  });
+});