Two salvage follow-ups on top of @dlkakbs's plugin runtime.
1. Install a drop-scheduler when the runtime fails to build.
Previously when ``build_pipeline_runtime()`` raised (e.g. missing
Graph env vars, subscription store path unwritable), ``bind_gateway_runtime``
logged a warning and returned False, leaving the msgraph_webhook
adapter with no scheduler at all. Incoming Graph notifications
would then fall back to the adapter's default ``handle_message``
path, which produces a raw JSON dump as a user-role message — not
useful and fires every time Graph retries.
Now a no-op drop-scheduler is installed instead, so:
- Graph notifications ack cleanly (202) so Graph stops retrying.
- The failure is surfaced once in the log with the error.
- No user-role messages get manufactured from raw change payloads.
The adapter is still bindable later once the runtime becomes
available (e.g. after the operator runs ``hermes teams-pipeline
validate`` and fixes the config), since the gateway's
``_teams_pipeline_runtime`` sentinel wasn't set to a non-None value.
2. Test wiring for ``_teams_pipeline_plugin_enabled()`` gate.
The happy-path runner-wiring tests monkeypatched ``bind_gateway_runtime``
but not ``_load_gateway_config``. In the hermetic test environment
the real config read ran, saw no enabled plugins, and short-circuited
the bind call before the test could observe it — so the test
expected ``calls == [runner]`` but got ``calls == []``.
Adds a ``_load_gateway_config`` monkeypatch with
``plugins.enabled = ["teams_pipeline"]`` to the happy-path tests.
The explicit-disabled test ``test_gateway_runner_skips_wiring_when_teams_pipeline_plugin_disabled``
already patches the config correctly.
Also renames ``test_bind_gateway_runtime_leaves_scheduler_unchanged_on_failure``
to ``test_bind_gateway_runtime_installs_drop_scheduler_on_failure``
and updates the assertion — this test contradicted the drop-scheduler
test in ``tests/plugins/test_teams_pipeline_plugin.py`` which
expected the scheduler to be installed. The plugin-test name
(``test_bind_gateway_runtime_drops_notifications_when_unavailable``)
clearly describes the intended behavior; fixing the wiring-test
assertion aligns both tests.
Validation:
- ``scripts/run_tests.sh tests/plugins/test_teams_pipeline_plugin.py
tests/gateway/test_teams_pipeline_runtime_wiring.py
tests/hermes_cli/test_teams_pipeline_plugin_cli.py`` — 25/25 passed.
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