Add bundled pi default and session token reporting

src/agents/context.ts

@@ -0,0 +1,34 @@
+// Lazy-load pi-ai model metadata so we can infer context windows when the agent
+// reports a model id. pi-coding-agent depends on @mariozechner/pi-ai, so it
+// should be present whenever CLAWDIS is installed from npm.
+
+type ModelEntry = { id: string; contextWindow?: number };
+
+const MODEL_CACHE = new Map<string, number>();
+const loadPromise = (async () => {
+  try {
+    const piAi = (await import("@mariozechner/pi-ai")) as {
+      getProviders: () => string[];
+      getModels: (provider: string) => ModelEntry[];
+    };
+    const providers = piAi.getProviders();
+    for (const p of providers) {
+      const models = piAi.getModels(p) as ModelEntry[];
+      for (const m of models) {
+        if (!m?.id) continue;
+        if (typeof m.contextWindow === "number" && m.contextWindow > 0) {
+          MODEL_CACHE.set(m.id, m.contextWindow);
+        }
+      }
+    }
+  } catch {
+    // If pi-ai isn't available, leave cache empty; lookup will fall back.
+  }
+})();
+
+export function lookupContextTokens(modelId?: string): number | undefined {
+  if (!modelId) return undefined;
+  // Best-effort: kick off loading, but don't block.
+  void loadPromise;
+  return MODEL_CACHE.get(modelId);
+}