Add local host mode and configurable LLM providers

apps/device-host-agent/host_agent/cli.py

@@ -2,7 +2,9 @@ from __future__ import annotations
 
 import argparse
 import getpass
+import os
 import sys
+from pathlib import Path
 from collections.abc import Sequence
 from dataclasses import replace
 
@@ -18,6 +20,7 @@ class LocalAccountSetupError(RuntimeError):
 
 
 def main(argv: Sequence[str] | None = None) -> None:
+    _load_dotenv()
     parser = argparse.ArgumentParser(description="Run the Device Host Agent")
     subparsers = parser.add_subparsers(dest="command")
     subparsers.add_parser("setup", help="Create the local operator account")
@@ -96,3 +99,19 @@ def _prompt_and_create(store: LocalAccountStore):
     if password != confirm:
         raise LocalAccountSetupError("passwords do not match")
     return store.create(username, password)
+
+
+def _load_dotenv() -> None:
+    """Load a simple repository-root .env without overriding shell values."""
+    path = Path.cwd() / ".env"
+    if not path.is_file():
+        return
+    for line in path.read_text(encoding="utf-8").splitlines():
+        line = line.strip()
+        if not line or line.startswith("#") or "=" not in line:
+            continue
+        name, value = line.split("=", 1)
+        name = name.strip()
+        value = value.strip()
+        if name and name not in os.environ:
+            os.environ[name] = value