fix(cli): harden process identity portability

nanobot/cli/process_identity.py

@@ -7,11 +7,18 @@ import os
 from pathlib import Path
 from typing import Final
 
-from setproctitle import setproctitle
-
 _ROLES: Final = {"agent", "gateway", "webui"}
 
 
+def _set_process_title(title: str) -> None:
+    # Process titles are short; do not trade Linux /proc environment visibility for
+    # extra title storage. setproctitle reads this switch when it is imported.
+    os.environ.setdefault("SPT_NOENV", "1")
+    from setproctitle import setproctitle
+
+    setproctitle(title)
+
+
 def set_cli_process_identity(args: list[str]) -> None:
     """Name this CLI process after the nanobot role it is running."""
     if os.name == "nt":
@@ -19,7 +26,7 @@ def set_cli_process_identity(args: list[str]) -> None:
         # which packaging already generates as ``nanobot.exe``.
         return
     role = args[0] if args and args[0] in _ROLES else None
-    setproctitle(f"nanobot-{role}" if role else "nanobot")
+    _set_process_title(f"nanobot-{role}" if role else "nanobot")
 
 
 def named_executable(executable: str, *, name: str, directory: Path) -> str: