A ``providers.<name>`` block in ``config.yaml`` can now opt out of being
listed anywhere by setting ``enabled: false`` — without removing the
block, so re-enabling it stays a one-line edit. Missing or ``true`` keeps
the previous behaviour (enabled), so this is fully backwards-compatible.
The flag is honoured in four places:
* ``hermes_cli/model_switch.py`` — model-override validation (the
allow-list that the picker consults to accept a non-public model id)
and the picker's own endpoint iteration. A disabled provider no longer
appears as a row and its models can't be silently accepted via
override.
* ``hermes_cli/runtime_provider.py`` — the runtime resolver skips
disabled blocks, so an explicit ``--provider X`` against a disabled
entry fails fast instead of using stale base_url / api_key from the
ignored block.
* ``hermes_cli/doctor.py`` — the doctor's "configured providers" set
excludes disabled entries, so health checks don't flag missing API
keys for providers the user has turned off.
Motivation: when a user has 20+ providers wired up in ``config.yaml``
(many of them only used occasionally) the picker becomes noisy and the
runtime resolver may pick a suboptimal one on ambiguous --provider names.
There's currently no way to hide a provider short of deleting its block
— which loses the api_key + base_url + custom routing config the user
spent time wiring. ``enabled: false`` lets them keep the config but get
it out of the way.
The helper ``is_provider_enabled()`` in ``hermes_cli/config.py``
centralises the gate (and accepts YAML-stringified booleans like
``"false"`` for hand-edited configs). 17 unit tests cover the defaults
and edge cases.
A follow-up PR can wire ``hermes provider enable/disable <name>`` and a
dashboard toggle on top of this primitive — they reduce to mutating the
flag.
nnnet
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