feat(FN-3332): add droid runtime plugin with event bridge and process manag

The merge delivers a new `fusion-plugin-droid-runtime` plugin providing a full MCP server and runtime adapter for droid-based agents, with event bridging, process management, tool mapping, and a prompt builder. It also adds agent delegation and org hierarchy tools to the pi extension, while fixing a

Fusion-Task-Id: FN-3332

plugins/fusion-plugin-droid-runtime/src/stream-parser.ts

@@ -0,0 +1,37 @@
+import type { NdjsonMessage } from "./types.js";
+
+/**
+ * Parse a single NDJSON line from Droid CLI stdout into a typed message.
+ *
+ * This function is deliberately resilient -- it never throws. Debug noise,
+ * empty lines, and malformed JSON all return null so the streaming pipeline
+ * can safely skip them and continue processing.
+ */
+export function parseLine(line: string): NdjsonMessage | null {
+  const trimmed = line.trim();
+
+  // Skip empty lines
+  if (!trimmed) {
+    return null;
+  }
+
+  // Skip non-JSON lines (debug output like "[SandboxDebug] ...")
+  if (!trimmed.startsWith("{")) {
+    return null;
+  }
+
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(trimmed);
+  } catch {
+    console.error("Failed to parse NDJSON line:", trimmed);
+    return null;
+  }
+
+  // Validate that the parsed result is a non-null object (not array, not primitive)
+  if (parsed === null || typeof parsed !== "object" || Array.isArray(parsed)) {
+    return null;
+  }
+
+  return parsed as NdjsonMessage;
+}