Config: expose Pi compaction tuning values (openclaw#21568) thanks @Takhoffman

Verified:
- pnpm install --frozen-lockfile
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: Takhoffman <781889+Takhoffman@users.noreply.github.com>

src/agents/pi-settings.ts

@@ -4,7 +4,13 @@ export const DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR = 20_000;
 
 type PiSettingsManagerLike = {
   getCompactionReserveTokens: () => number;
-  applyOverrides: (overrides: { compaction: { reserveTokens: number } }) => void;
+  getCompactionKeepRecentTokens: () => number;
+  applyOverrides: (overrides: {
+    compaction: {
+      reserveTokens?: number;
+      keepRecentTokens?: number;
+    };
+  }) => void;
 };
 
 export function ensurePiCompactionReserveTokens(params: {
@@ -32,3 +38,60 @@ export function resolveCompactionReserveTokensFloor(cfg?: OpenClawConfig): numbe
   }
   return DEFAULT_PI_COMPACTION_RESERVE_TOKENS_FLOOR;
 }
+
+function toNonNegativeInt(value: unknown): number | undefined {
+  if (typeof value !== "number" || !Number.isFinite(value) || value < 0) {
+    return undefined;
+  }
+  return Math.floor(value);
+}
+
+function toPositiveInt(value: unknown): number | undefined {
+  if (typeof value !== "number" || !Number.isFinite(value) || value <= 0) {
+    return undefined;
+  }
+  return Math.floor(value);
+}
+
+export function applyPiCompactionSettingsFromConfig(params: {
+  settingsManager: PiSettingsManagerLike;
+  cfg?: OpenClawConfig;
+}): {
+  didOverride: boolean;
+  compaction: { reserveTokens: number; keepRecentTokens: number };
+} {
+  const currentReserveTokens = params.settingsManager.getCompactionReserveTokens();
+  const currentKeepRecentTokens = params.settingsManager.getCompactionKeepRecentTokens();
+  const compactionCfg = params.cfg?.agents?.defaults?.compaction;
+
+  const configuredReserveTokens = toNonNegativeInt(compactionCfg?.reserveTokens);
+  const configuredKeepRecentTokens = toPositiveInt(compactionCfg?.keepRecentTokens);
+  const reserveTokensFloor = resolveCompactionReserveTokensFloor(params.cfg);
+
+  const targetReserveTokens = Math.max(
+    configuredReserveTokens ?? currentReserveTokens,
+    reserveTokensFloor,
+  );
+  const targetKeepRecentTokens = configuredKeepRecentTokens ?? currentKeepRecentTokens;
+
+  const overrides: { reserveTokens?: number; keepRecentTokens?: number } = {};
+  if (targetReserveTokens !== currentReserveTokens) {
+    overrides.reserveTokens = targetReserveTokens;
+  }
+  if (targetKeepRecentTokens !== currentKeepRecentTokens) {
+    overrides.keepRecentTokens = targetKeepRecentTokens;
+  }
+
+  const didOverride = Object.keys(overrides).length > 0;
+  if (didOverride) {
+    params.settingsManager.applyOverrides({ compaction: overrides });
+  }
+
+  return {
+    didOverride,
+    compaction: {
+      reserveTokens: targetReserveTokens,
+      keepRecentTokens: targetKeepRecentTokens,
+    },
+  };
+}