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:

tests/cli/test_process_identity.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import os
 from pathlib import Path
 
 import pytest
@@ -24,7 +25,7 @@ def test_cli_process_identity_uses_product_and_role(
 ) -> None:
     titles: list[str] = []
     monkeypatch.setattr("nanobot.cli.process_identity.os.name", "posix")
-    monkeypatch.setattr("nanobot.cli.process_identity.setproctitle", titles.append)
+    monkeypatch.setattr("nanobot.cli.process_identity._set_process_title", titles.append)
 
     set_cli_process_identity(args)
 
@@ -36,7 +37,7 @@ def test_cli_process_identity_keeps_windows_launcher_name(
 ) -> None:
     titles: list[str] = []
     monkeypatch.setattr("nanobot.cli.process_identity.os.name", "nt")
-    monkeypatch.setattr("nanobot.cli.process_identity.setproctitle", titles.append)
+    monkeypatch.setattr("nanobot.cli.process_identity._set_process_title", titles.append)
 
     set_cli_process_identity(["agent"])
 
@@ -44,12 +45,12 @@ def test_cli_process_identity_keeps_windows_launcher_name(
 
 
 def test_named_executable_creates_stable_role_symlink(
-    monkeypatch: pytest.MonkeyPatch,
     tmp_path: Path,
 ) -> None:
+    if os.name == "nt":
+        pytest.skip("POSIX symlink naming is not used on Windows")
     executable = tmp_path / "bun"
     executable.write_text("runtime", encoding="utf-8")
-    monkeypatch.setattr("nanobot.cli.process_identity.os.name", "posix")
 
     first = Path(
         named_executable(executable.as_posix(), name="nanobot-tui", directory=tmp_path / "run")