Problem

Custom providers defined in config.yaml under custom_providers: were invisible to the /model command in both gateway (Telegram, Discord, etc.) and CLI. Explicit switching via --provider failed with "Unknown provider".

Root Cause

gateway/run.py, cli.py, and model_switch.py only read the providers: dict from config, ignoring custom_providers: entirely. The resolution chain in providers.py also had no step for custom providers.

Changes

hermes_cli/providers.py

• Add resolve_custom_provider() to match custom providers by name or slug (custom:<display-name>)
• Extend resolve_provider_full() to check custom_providers after user_providers in the resolution chain

hermes_cli/model_switch.py

• Propagate custom_providers through switch_model(), list_authenticated_providers(), and get_authenticated_provider_slugs()
• Add custom provider section to provider listings with proper slug, name, and default model
• Fix provider label display for custom providers (show display name instead of slug)

gateway/run.py

• Read custom_providers from config.yaml
• Pass to all model-switch function calls

cli.py

• Hoist config loading to read both providers and custom_providers
• Pass both to listing and switch calls

Tests

4 new regression tests:

• test_list_authenticated_providers_includes_custom_providers — verifies custom providers appear in listings
• test_switch_model_explicit_custom_provider_resolution — verifies explicit --provider custom:slug resolves
• test_switch_model_custom_provider_label — verifies display name used in result
• test_handle_model_command_lists_saved_custom_provider — verifies gateway command handler includes custom providers

All 71 tests pass (67 existing + 4 new).

Example Config

custom_providers:
  - name: Local (127.0.0.1:4141)
    base_url: http://127.0.0.1:4141/v1
    model: lacal7b

Now shows up as custom:local-(127.0.0.1:4141) in /model listings and is switchable.