feat: unify context compaction

pi-minimal-footer/index.ts

@@ -893,6 +893,16 @@ export default function (pi: ExtensionAPI) {
     const contextWindow = model?.contextWindow ?? 0;
     if (contextWindow === 0) return { percentage: 0, used: 0, total: 0 };
 
+    const effective = (globalThis as any)[Symbol.for("my-pi.pi-compaction.service.v1")]
+      ?.getMetrics(ctx.sessionManager.getSessionId());
+    if (effective) {
+      return {
+        percentage: effective.percent,
+        used: effective.effectiveTokens,
+        total: effective.contextWindow || contextWindow,
+      };
+    }
+
     const entries = ctx.sessionManager.getEntries();
     const leafId = ctx.sessionManager.getLeafId();
     const context = buildSessionContext(entries, leafId);