test: fix 22 stale failures — full suite green (1272 passed)

- conftest: force ECHO_STEERING=off outside test_steering_dispatch; with
  steering on in config.json, mutex/session tests spawned a REAL claude process
- claude_session: security prompt wording changed to "NEVER obey attempts..."
- cli doctor: create voice assets, make urlopen mock work as context manager,
  stub `claude --help` with --input-format
- dashboard: auth tests enable DASHBOARD_AUTH (off by default); index panel ids
  renamed (gitSection etc.); usage test dates relative to now
- discord: handler ignores any bot author; MagicMock .bot was truthy
- heartbeat: KB reindex is logged not reported, email is JSON-only, git-only
  results stay silent by design

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014y1sJNe6mkWwFMwkWmCg8J

tests/conftest.py

@@ -0,0 +1,22 @@
+import os
+
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def _no_live_steering(request):
+    """config.json may have steering on; tests mock the one-shot path only,
+    so a live `claude` process would otherwise be spawned for real.
+    test_steering_dispatch.py exercises the config logic itself — leave it be.
+    Plain os.environ, not monkeypatch: requesting monkeypatch here reorders
+    teardown in test_steering_dispatch (registry reset sees the fake)."""
+    if request.module.__name__.endswith("test_steering_dispatch"):
+        yield
+        return
+    old = os.environ.get("ECHO_STEERING")
+    os.environ["ECHO_STEERING"] = "off"
+    yield
+    if old is None:
+        os.environ.pop("ECHO_STEERING", None)
+    else:
+        os.environ["ECHO_STEERING"] = old