The two ACP slash-command tests that exercise `provider:model` routing
(`test_set_session_model_accepts_provider_prefixed_choice` and
`test_model_switch_uses_requested_provider`) relied on the live
`hermes_cli.models._KNOWN_PROVIDER_NAMES` / `_PROVIDER_ALIASES` module
state to parse `anthropic:claude-sonnet-4-6` into
`("anthropic", "claude-sonnet-4-6")`. If any earlier test in the same
xdist worker registers a custom provider that shadows `anthropic` or
otherwise mutates those globals, the parser falls into the
`detect_provider_for_model` branch and resolves to `custom` instead.
Observed once in CI on run 26326728502 / job 77505732299 as
`AssertionError: assert 'custom' == 'anthropic'` — could not reproduce
locally under per-file isolation, so the failing in-file order was
specific to a particular xdist scheduling.
Monkeypatching `parse_model_input` + `detect_provider_for_model` for
both tests removes the global-catalog dependency, so the tests now only
exercise what they were written to verify (the `requested_provider ->
runtime -> AIAgent kwargs` plumbing).
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