chore: OpenClaw capture handler (llm_output) + ledger sync

- openclaw-plugins/atocore-capture/handler.js: simplified version
  using before_agent_start + llm_output hooks (survives gateway
  restarts). The production copy lives on T420 at
  /tmp/atocore-openclaw-capture-plugin/openclaw-plugins/atocore-capture/
- DEV-LEDGER: updated orientation (live_sha b687e7f, capture clients)
  and session log for 2026-04-16

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

openclaw-plugins/atocore-capture/handler.js

@@ -0,0 +1,63 @@
+/**
+ * AtoCore capture hook for OpenClaw.
+ *
+ * Listens on message:received (buffer prompt) and message:sent (POST pair).
+ * Fail-open: errors are caught silently.
+ */
+
+const BASE_URL = process.env.ATOCORE_BASE_URL || "http://dalidou:8100";
+const MIN_LEN = 15;
+const MAX_RESP = 50000;
+
+let lastPrompt = null; // simple single-slot buffer
+
+const atocoreCaptureHook = async (event) => {
+  try {
+    if (process.env.ATOCORE_CAPTURE_DISABLED === "1") return;
+
+    if (event.type === "message" && event.action === "received") {
+      const content = (event.context?.content || "").trim();
+      if (content.length >= MIN_LEN && !content.startsWith("<")) {
+        lastPrompt = { text: content, ts: Date.now() };
+      }
+      return;
+    }
+
+    if (event.type === "message" && event.action === "sent") {
+      if (!event.context?.success) return;
+      const response = (event.context?.content || "").trim();
+      if (!response || !lastPrompt) return;
+
+      // Discard stale prompts (>5 min old)
+      if (Date.now() - lastPrompt.ts > 300000) {
+        lastPrompt = null;
+        return;
+      }
+
+      const prompt = lastPrompt.text;
+      lastPrompt = null;
+
+      const body = JSON.stringify({
+        prompt,
+        response: response.length > MAX_RESP
+          ? response.slice(0, MAX_RESP) + "\n\n[truncated]"
+          : response,
+        client: "openclaw",
+        session_id: event.sessionKey || "",
+        project: "",
+        reinforce: true,
+      });
+
+      fetch(BASE_URL.replace(/\/$/, "") + "/interactions", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body,
+        signal: AbortSignal.timeout(10000),
+      }).catch(() => {});
+    }
+  } catch {
+    // fail-open: never crash the gateway
+  }
+};
+
+export default atocoreCaptureHook;