Merge branch 'main' into bb/gui

hermes_cli/web_server.py

@@ -929,7 +929,7 @@ def _tail_lines(path: Path, n: int) -> List[str]:
     if not path.exists():
         return []
     try:
-        text = path.read_text(errors="replace")
+        text = path.read_text(encoding="utf-8", errors="replace")
     except OSError:
         return []
     lines = text.splitlines()
@@ -3756,7 +3756,20 @@ async def get_models_analytics(days: int = 30):
 import re
 import asyncio
 
-from hermes_cli.pty_bridge import PtyBridge, PtyUnavailableError
+# PTY bridge is POSIX-only (depends on fcntl/termios/ptyprocess).  On native
+# Windows the import raises; catch and leave PtyBridge=None so the rest of
+# the dashboard (sessions, jobs, metrics, config editor) still loads and the
+# /api/pty endpoint cleanly refuses with a WSL-suggested message.
+try:
+    from hermes_cli.pty_bridge import PtyBridge, PtyUnavailableError
+    _PTY_BRIDGE_AVAILABLE = True
+except ImportError as _pty_import_err:  # pragma: no cover - Windows-only path
+    PtyBridge = None  # type: ignore[assignment]
+    _PTY_BRIDGE_AVAILABLE = False
+
+    class PtyUnavailableError(RuntimeError):  # type: ignore[no-redef]
+        """Stub on platforms where pty_bridge can't be imported."""
+        pass
 
 _RESIZE_RE = re.compile(rb"\x1b\[RESIZE:(\d+);(\d+)\]")
 _PTY_READ_CHUNK_TIMEOUT = 0.2
@@ -3911,6 +3924,18 @@ async def pty_ws(ws: WebSocket) -> None:
 
     await ws.accept()
 
+    # On native Windows, the POSIX PTY bridge can't be imported.  Tell the
+    # client and close cleanly rather than pretending the feature works.
+    if not _PTY_BRIDGE_AVAILABLE:
+        await ws.send_text(
+            "\r\n\x1b[31mChat unavailable: the embedded terminal requires a "
+            "POSIX PTY, which native Windows Python doesn't provide.\x1b[0m\r\n"
+            "\x1b[33mInstall Hermes inside WSL2 to use the dashboard's /chat "
+            "tab — the rest of the dashboard works here.\x1b[0m\r\n"
+        )
+        await ws.close(code=1011)
+        return
+
     # --- spawn PTY ------------------------------------------------------
     resume = ws.query_params.get("resume") or None
     channel = _channel_or_close_code(ws)