fix: doctor + termux-audio container-env parity

- doctor: 'inside a container' branch rewrote terminal_env to local for
  EVERY non-docker backend, so TERMINAL_ENV=vercel_sandbox diagnostics
  vanished when doctor ran inside a container (CI runner pods). Scope
  the informational skip to the implicit local case only; remote
  backends keep their real diagnostics. Fixes
  test_doctor_reports_vercel_backend_diagnostics on ARC runners — and
  for actual users running doctor in the Docker distribution with a
  remote terminal backend configured.
- termux audio test: detect_audio_environment() probes the real host
  for containment; pin is_container=False (a Termux device is never a
  container) so the containerized runner doesn't flip available=False.

hermes_cli/doctor.py

@@ -1727,13 +1727,14 @@ def run_doctor(args):
         # not found" warning. If the user has explicitly chosen
         # TERMINAL_ENV=docker inside the container they likely mounted
         # /var/run/docker.sock, so fall through to the normal check.
-        if terminal_env != "docker":
+        # Only the implicit local-vs-docker choice is affected: remote
+        # backends (ssh, daytona, vercel_sandbox, ...) work fine from
+        # inside a container and must keep their real diagnostics.
+        if terminal_env == "local":
             check_info(
                 "Running inside a container — using local terminal backend "
                 "(docker-in-docker is not configured by default)"
             )
-            # Skip to next section; Docker isn't relevant here.
-            terminal_env = "local"
     if terminal_env == "docker":
         if _safe_which("docker"):
             # Check if docker daemon is running

tests/tools/test_termux_api_detection.py

@@ -166,6 +166,12 @@ class TestDetectAudioEnvironmentTermuxFallback:
         monkeypatch.delenv("SSH_CLIENT", raising=False)
         monkeypatch.delenv("SSH_TTY", raising=False)
         monkeypatch.delenv("SSH_CONNECTION", raising=False)
+        # detect_audio_environment() also probes the REAL host for
+        # containment; a containerized CI runner would append the
+        # container warning and flip available=False. A Termux device is
+        # never a container — pin the probe to the scenario under test.
+        import hermes_constants
+        monkeypatch.setattr(hermes_constants, "is_container", lambda: False)
 
         # No sounddevice — we go down the Termux:API branch.
         monkeypatch.setattr(