docs: fix 40+ discrepancies between documentation and codebase (#5818)

Comprehensive audit of all ~100 doc pages against the actual code, fixing:

Reference docs:
- HERMES_API_TIMEOUT default 900 -> 1800 (env-vars)
- TERMINAL_DOCKER_IMAGE default python:3.11 -> nikolaik/python-nodejs (env-vars)
- compression.summary_model default shown as gemini -> actually empty string (env-vars)
- Add missing GOOGLE_API_KEY, GEMINI_API_KEY, GEMINI_BASE_URL env vars (env-vars)
- Add missing /branch (/fork) slash command (slash-commands)
- Fix hermes-cli tool count 39 -> 38 (toolsets-reference)
- Fix hermes-api-server drop list to include text_to_speech (toolsets-reference)
- Fix total tool count 47 -> 48, standalone 14 -> 15 (tools-reference)

User guide:
- web_extract.timeout default 30 -> 360 (configuration)
- Remove display.theme_mode (not implemented in code) (configuration)
- Remove display.background_process_notifications (not in defaults) (configuration)
- Browser inactivity timeout 300/5min -> 120/2min (browser)
- Screenshot path browser_screenshots -> cache/screenshots (browser)
- batch_runner default model claude-sonnet-4-20250514 -> claude-sonnet-4.6
- Add minimax to TTS provider list (voice-mode)
- Remove credential_pool_strategies from auth.json example (credential-pools)
- Fix Slack token path platforms/slack/ -> root ~/.hermes/ (slack)
- Fix Matrix store path for new installs (matrix)
- Fix WhatsApp session path for new installs (whatsapp)
- Fix HomeAssistant config from gateway.json to config.yaml (homeassistant)
- Fix WeCom gateway start command (wecom)

Developer guide:
- Fix tool/toolset counts in architecture overview
- Update line counts: main.py ~5500, setup.py ~3100, run.py ~7500, mcp_tool ~2200
- Replace nonexistent agent/memory_store.py with memory_manager.py + memory_provider.py
- Update _discover_tools() list: remove honcho_tools, add skill_manager_tool
- Add session_search and delegate_task to intercepted tools list (agent-loop)
- Fix budget warning: two-tier system (70% caution, 90% warning) (agent-loop)
- Fix gateway auth order (per-platform first, global last) (gateway-internals)
- Fix email_adapter.py -> email.py, add webhook.py + api_server.py (gateway-internals)
- Add 7 missing providers to provider-runtime list

Other:
- Add Docker --cap-add entries to security doc
- Fix Python version 3.10+ -> 3.11+ (contributing)
- Fix AGENTS.md discovery claim (not hierarchical walk) (tips)
- Fix cron 'add' -> canonical 'create' (cron-internals)
- Add pre_api_request/post_api_request hooks to plugin guide
- Add Google/Gemini provider to providers page
- Clarify OPENAI_BASE_URL deprecation (providers)

website/docs/reference/environment-variables.md

@@ -39,6 +39,9 @@ All variables go in `~/.hermes/.env`. You can also set them with `hermes config
 | `KILOCODE_BASE_URL` | Override Kilo Code base URL (default: `https://api.kilo.ai/api/gateway`) |
 | `HF_TOKEN` | Hugging Face token for Inference Providers ([huggingface.co/settings/tokens](https://huggingface.co/settings/tokens)) |
 | `HF_BASE_URL` | Override Hugging Face base URL (default: `https://router.huggingface.co/v1`) |
+| `GOOGLE_API_KEY` | Google AI Studio API key ([aistudio.google.com/app/apikey](https://aistudio.google.com/app/apikey)) |
+| `GEMINI_API_KEY` | Alias for `GOOGLE_API_KEY` |
+| `GEMINI_BASE_URL` | Override Google AI Studio base URL |
 | `ANTHROPIC_API_KEY` | Anthropic Console API key ([console.anthropic.com](https://console.anthropic.com/)) |
 | `ANTHROPIC_TOKEN` | Manual or legacy Anthropic OAuth/setup-token override |
 | `DASHSCOPE_API_KEY` | Alibaba Cloud DashScope API key for Qwen models ([modelstudio.console.alibabacloud.com](https://modelstudio.console.alibabacloud.com/)) |
@@ -108,7 +111,7 @@ For native Anthropic auth, Hermes prefers Claude Code's own credential files whe
 | Variable | Description |
 |----------|-------------|
 | `TERMINAL_ENV` | Backend: `local`, `docker`, `ssh`, `singularity`, `modal`, `daytona` |
-| `TERMINAL_DOCKER_IMAGE` | Docker image (default: `python:3.11`) |
+| `TERMINAL_DOCKER_IMAGE` | Docker image (default: `nikolaik/python-nodejs:python3.11-nodejs20`) |
 | `TERMINAL_DOCKER_FORWARD_ENV` | JSON array of env var names to explicitly forward into Docker terminal sessions. Note: skill-declared `required_environment_variables` are forwarded automatically — you only need this for vars not declared by any skill. |
 | `TERMINAL_DOCKER_VOLUMES` | Additional Docker volume mounts (comma-separated `host:container` pairs) |
 | `TERMINAL_DOCKER_MOUNT_CWD_TO_WORKSPACE` | Advanced opt-in: mount the launch cwd into Docker `/workspace` (`true`/`false`, default: `false`) |
@@ -262,7 +265,7 @@ For cloud sandbox backends, persistence is filesystem-oriented. `TERMINAL_LIFETI
 | `HERMES_HUMAN_DELAY_MIN_MS` | Custom delay range minimum (ms) |
 | `HERMES_HUMAN_DELAY_MAX_MS` | Custom delay range maximum (ms) |
 | `HERMES_QUIET` | Suppress non-essential output (`true`/`false`) |
-| `HERMES_API_TIMEOUT` | LLM API call timeout in seconds (default: `900`) |
+| `HERMES_API_TIMEOUT` | LLM API call timeout in seconds (default: `1800`) |
 | `HERMES_EXEC_ASK` | Enable execution approval prompts in gateway mode (`true`/`false`) |
 | `HERMES_ENABLE_PROJECT_PLUGINS` | Enable auto-discovery of repo-local plugins from `./.hermes/plugins/` (`true`/`false`, default: `false`) |
 | `HERMES_BACKGROUND_NOTIFICATIONS` | Background process notification mode in gateway: `all` (default), `result`, `error`, `off` |
@@ -283,7 +286,7 @@ Context compression is configured exclusively through the `compression` section
 compression:
   enabled: true
   threshold: 0.50
-  summary_model: google/gemini-3-flash-preview
+  summary_model: ""                            # empty = use main configured model
   summary_provider: auto
   summary_base_url: null  # Custom OpenAI-compatible endpoint for summaries
 ```