Initial commit: Agentic OS troubleshooting platform

Self-hosted, Docker-based agentic troubleshooting platform: FastAPI backend +
LangGraph agent, Next.js UI, tiered LLM routing (local Ollama -> Gemini ->
DeepSeek -> OpenRouter), MCP server manager, encrypted device credentials,
RBAC, audit log, project-memory + Obsidian integrations, and editable
troubleshooting decision rules tuned for the GeneseasX vessel stack.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/agent/json_utils.py

@@ -0,0 +1,24 @@
+"""Shared helpers for extracting JSON objects from LLM responses."""
+from __future__ import annotations
+
+import json
+
+
+def parse_json(text: str) -> dict:
+    """Best-effort extraction of a single JSON object from LLM output.
+
+    Handles fenced ```json blocks and leading/trailing prose by slicing
+    between the first '{' and last '}'. Returns {} when nothing parses.
+    """
+    text = text.strip()
+    if text.startswith("```"):
+        text = text.split("```", 2)[1]
+        if text.startswith("json"):
+            text = text[4:]
+    start, end = text.find("{"), text.rfind("}")
+    if start != -1 and end != -1:
+        try:
+            return json.loads(text[start : end + 1])
+        except json.JSONDecodeError:
+            pass
+    return {}