fix(gateway): route --all stop/restart through s6 under container

PR #30136 review caught that `hermes gateway stop --all` and
`... restart --all` were broken under s6. The Phase 4 dispatcher was
gated on `not stop_all` (and the symmetric restart_all), so `--all`
fell through to `kill_gateway_processes(all_profiles=True)`. pkill
SIGTERMed every gateway, s6-supervise observed the crashes, and
restarted every gateway ~1s later — net effect: `--all` *kicked*
gateways instead of *stopping* them.

Add `_dispatch_all_via_service_manager_if_s6(action)` that iterates
`mgr.list_profile_gateways()` and routes stop/restart through each
service slot. s6's `want up`/`want down` flips correctly, so a
stop persists. Partial failures are surfaced per-profile with a
running success count; the host pkill path is only reached when s6
isn't in play.

`start --all` isn't a CLI surface — the helper rejects it and
returns False (host code path can take over).

tests/hermes_cli/test_gateway_s6_dispatch.py

@@ -115,3 +115,147 @@ def test_dispatch_defaults_profile_to_default(
     )
     assert gw._dispatch_via_service_manager_if_s6("start") is True
     assert rec.calls == [("start", "gateway-default")]
+
+
+# ---------------------------------------------------------------------------
+# _dispatch_all_via_service_manager_if_s6 — --all under s6
+# ---------------------------------------------------------------------------
+
+
+class _ListingRecorder(_CallRecorder):
+    """_CallRecorder that also exposes a profile list."""
+
+    def __init__(self, profiles: list[str]) -> None:
+        super().__init__()
+        self._profiles = profiles
+
+    def list_profile_gateways(self) -> list[str]:
+        return list(self._profiles)
+
+
+def test_dispatch_all_returns_false_on_host(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    from hermes_cli import gateway as gw
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.detect_service_manager", lambda: "systemd",
+    )
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.get_service_manager",
+        lambda: pytest.fail("manager should not be constructed on host"),
+    )
+    assert gw._dispatch_all_via_service_manager_if_s6("stop") is False
+
+
+def test_dispatch_all_iterates_every_profile_on_stop(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture,
+) -> None:
+    from hermes_cli import gateway as gw
+    rec = _ListingRecorder(["coder", "writer", "assistant"])
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.detect_service_manager", lambda: "s6",
+    )
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.get_service_manager", lambda: rec,
+    )
+    assert gw._dispatch_all_via_service_manager_if_s6("stop") is True
+    assert rec.calls == [
+        ("stop", "gateway-coder"),
+        ("stop", "gateway-writer"),
+        ("stop", "gateway-assistant"),
+    ]
+    out = capsys.readouterr().out
+    assert "Stopped 3 profile gateway(s)" in out
+
+
+def test_dispatch_all_iterates_every_profile_on_restart(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture,
+) -> None:
+    from hermes_cli import gateway as gw
+    rec = _ListingRecorder(["coder", "writer"])
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.detect_service_manager", lambda: "s6",
+    )
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.get_service_manager", lambda: rec,
+    )
+    assert gw._dispatch_all_via_service_manager_if_s6("restart") is True
+    assert rec.calls == [
+        ("restart", "gateway-coder"),
+        ("restart", "gateway-writer"),
+    ]
+    out = capsys.readouterr().out
+    assert "Restarted 2 profile gateway(s)" in out
+
+
+def test_dispatch_all_handles_partial_failure(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture,
+) -> None:
+    """A failure on one profile must not skip the others; the helper
+    reports each failure and the success count."""
+    from hermes_cli import gateway as gw
+
+    class _FailOnWriter(_ListingRecorder):
+        def stop(self, name: str) -> None:
+            if name == "gateway-writer":
+                raise RuntimeError("supervise FIFO permission denied")
+            super().stop(name)
+
+    rec = _FailOnWriter(["coder", "writer", "assistant"])
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.detect_service_manager", lambda: "s6",
+    )
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.get_service_manager", lambda: rec,
+    )
+    assert gw._dispatch_all_via_service_manager_if_s6("stop") is True
+    # The two successful ones were called; writer raised before recording.
+    assert ("stop", "gateway-coder") in rec.calls
+    assert ("stop", "gateway-assistant") in rec.calls
+    assert ("stop", "gateway-writer") not in rec.calls
+    out = capsys.readouterr().out
+    assert "Stopped 2 profile gateway(s)" in out
+    assert "Could not stop gateway-writer" in out
+    assert "supervise FIFO permission denied" in out
+
+
+def test_dispatch_all_empty_list_reports_and_returns_true(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture,
+) -> None:
+    """With no profile gateways registered the helper still claims the
+    dispatch (returns True) and prints a friendly message — the host
+    fallback would just pkill nothing, which isn't useful inside a
+    container."""
+    from hermes_cli import gateway as gw
+    rec = _ListingRecorder([])
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.detect_service_manager", lambda: "s6",
+    )
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.get_service_manager", lambda: rec,
+    )
+    assert gw._dispatch_all_via_service_manager_if_s6("stop") is True
+    assert rec.calls == []
+    assert "No profile gateways" in capsys.readouterr().out
+
+
+def test_dispatch_all_unknown_action_returns_false(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """`start --all` is not a supported CLI surface; the helper must
+    fall through to the host code path rather than no-op."""
+    from hermes_cli import gateway as gw
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.detect_service_manager", lambda: "s6",
+    )
+    monkeypatch.setattr(
+        "hermes_cli.service_manager.get_service_manager",
+        lambda: pytest.fail(
+            "manager should not be constructed for unsupported --all action",
+        ),
+    )
+    assert gw._dispatch_all_via_service_manager_if_s6("start") is False