docs: fix stale references across 8 doc pages

Audit found 24+ discrepancies between docs and code. Fixed:

HIGH severity:
- Remove honcho toolset from tools-reference, toolsets-reference, and tools.md
  (converted to memory provider plugin, not a built-in toolset)
- Add note that Honcho is available via plugin

MEDIUM severity:
- Add hermes memory command family to cli-commands.md (setup/status/off)
- Add --clone-all, --clone-from to profile create in cli-commands.md
- Add --max-turns option to hermes chat in cli-commands.md
- Add /btw slash command to slash-commands.md
- Fix profile show example output (remove nonexistent disk usage,
  add .env and SOUL.md status lines)
- Add missing hermes-webhook toolset to toolsets-reference.md
- Add 5 missing providers to fallback-providers.md table
- Add 7 missing providers to providers.md fallback list
- Fix outdated model examples: glm-4-plus→glm-5, moonshot-v1-auto→kimi-for-coding

website/docs/user-guide/features/fallback-providers.md

@@ -39,11 +39,16 @@ Both `provider` and `model` are **required**. If either is missing, the fallback
 | OpenRouter | `openrouter` | `OPENROUTER_API_KEY` |
 | Nous Portal | `nous` | `hermes login` (OAuth) |
 | OpenAI Codex | `openai-codex` | `hermes model` (ChatGPT OAuth) |
+| GitHub Copilot | `copilot` | `COPILOT_GITHUB_TOKEN`, `GH_TOKEN`, or `GITHUB_TOKEN` |
+| GitHub Copilot ACP | `copilot-acp` | External process (editor integration) |
 | Anthropic | `anthropic` | `ANTHROPIC_API_KEY` or Claude Code credentials |
 | z.ai / GLM | `zai` | `GLM_API_KEY` |
 | Kimi / Moonshot | `kimi-coding` | `KIMI_API_KEY` |
 | MiniMax | `minimax` | `MINIMAX_API_KEY` |
 | MiniMax (China) | `minimax-cn` | `MINIMAX_CN_API_KEY` |
+| DeepSeek | `deepseek` | `DEEPSEEK_API_KEY` |
+| OpenCode Zen | `opencode-zen` | `OPENCODE_ZEN_API_KEY` |
+| OpenCode Go | `opencode-go` | `OPENCODE_GO_API_KEY` |
 | Kilo Code | `kilocode` | `KILOCODE_API_KEY` |
 | Alibaba / DashScope | `alibaba` | `DASHSCOPE_API_KEY` |
 | Hugging Face | `huggingface` | `HF_TOKEN` |