docs: clarify hermes model vs /model — two commands, two purposes (#10276)

Users are confused about the difference between `hermes model` (terminal
command for full provider setup) and `/model` (session command for switching
between already-configured providers). This distinction was not documented
anywhere.

Changes across 4 doc pages:
- cli-commands.md: Added warning callout explaining the difference, added
  --global flag docs, added 'only see OpenRouter models?' info box
- slash-commands.md: Added notes on both TUI and messaging /model entries
  that /model only switches between configured providers
- providers.md: Added 'Two Commands for Model Management' comparison table
  near top of page, added warning callout in switching section
- faq.md: Added new FAQ entry '/model only shows one provider' with quick
  reference table

Prompted by user feedback in Discord — new users consistently hit this
confusion when trying to add providers from inside a session.
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@ -109,22 +109,31 @@ hermes chat --worktree -q "Review this repo and open a PR"
## `hermes model`
Interactive provider + model selector.
Interactive provider + model selector. **This is the command for adding new providers, setting up API keys, and running OAuth flows.** Run it from your terminal — not from inside an active Hermes chat session.
```bash
hermes model
```
Use this when you want to:
- switch default providers
- log into OAuth-backed providers during model selection
- **add a new provider** (OpenRouter, Anthropic, Copilot, DeepSeek, custom, etc.)
- log into OAuth-backed providers (Anthropic, Copilot, Codex, Nous Portal)
- enter or update API keys
- pick from provider-specific model lists
- configure a custom/self-hosted endpoint
- save the new default into config
:::warning hermes model vs /model — know the difference
**`hermes model`** (run from your terminal, outside any Hermes session) is the **full provider setup wizard**. It can add new providers, run OAuth flows, prompt for API keys, and configure endpoints.
**`/model`** (typed inside an active Hermes chat session) can only **switch between providers and models you've already set up**. It cannot add new providers, run OAuth, or prompt for API keys.
**If you need to add a new provider:** Exit your Hermes session first (`Ctrl+C` or `/quit`), then run `hermes model` from your terminal prompt.
:::
### `/model` slash command (mid-session)
Switch models without leaving a session:
Switch between already-configured models without leaving a session:
```
/model # Show current model and available options
@ -136,6 +145,16 @@ Switch models without leaving a session:
/model openrouter:anthropic/claude-sonnet-4 # Switch back to cloud
```
By default, `/model` changes apply **to the current session only**. Add `--global` to persist the change to `config.yaml`:
```
/model claude-sonnet-4 --global # Switch and save as new default
```
:::info What if I only see OpenRouter models?
If you've only configured OpenRouter, `/model` will only show OpenRouter models. To add another provider (Anthropic, DeepSeek, Copilot, etc.), exit your session and run `hermes model` from the terminal.
:::
Provider and base URL changes are persisted to `config.yaml` automatically. When switching away from a custom endpoint, the stale base URL is cleared to prevent it leaking into other providers.
## `hermes gateway`