docs: comprehensive documentation audit — fix 9 HIGH, 20+ MEDIUM gaps (#4087)

Reference docs fixes:
- cli-commands.md: remove non-existent --provider alibaba, add hermes
  profile/completion/plugins/mcp to top-level table, add --profile/-p
  global flag, add --source chat option
- slash-commands.md: add /yolo and /commands, fix /q alias conflict
  (resolves to /queue not /quit), add missing aliases (/bg, /set-home,
  /reload_mcp, /gateway)
- toolsets-reference.md: fix hermes-api-server (not same as hermes-cli,
  omits clarify/send_message/text_to_speech)
- profile-commands.md: fix show name required not optional, --clone-from
  not --from, add --remove/--name to alias, fix alias path, fix export/
  import arg types, remove non-existent fish completion
- tools-reference.md: add EXA_API_KEY to web tools requires_env
- mcp-config-reference.md: add auth key for OAuth, tool name sanitization
- environment-variables.md: add EXA_API_KEY, update provider values
- plugins.md: remove non-existent ctx.register_command(), add
  ctx.inject_message()

Feature docs additions:
- security.md: add /yolo mode, approval modes (manual/smart/off),
  configurable timeout, expanded dangerous patterns table
- cron.md: add wrap_response config, [SILENT] suppression
- mcp.md: add dynamic tool discovery, MCP sampling support
- cli.md: add Ctrl+Z suspend, busy_input_mode, tool_preview_length
- docker.md: add skills/credential file mounting

Messaging platform docs:
- telegram.md: add webhook mode, DoH fallback IPs
- slack.md: add multi-workspace OAuth support
- discord.md: add DISCORD_IGNORE_NO_MENTION
- matrix.md: add MSC3245 native voice messages
- feishu.md: expand from 129 to 365 lines (encrypt key, verification
  token, group policy, card actions, media, rate limiting, markdown,
  troubleshooting)
- wecom.md: expand from 86 to 264 lines (per-group allowlists, media,
  AES decryption, stream replies, reconnection, troubleshooting)

Configuration docs:
- quickstart.md: add DeepSeek, Copilot, Copilot ACP providers
- configuration.md: add DeepSeek provider, Exa web backend, terminal
  env_passthrough/images, browser.command_timeout, compression params,
  discord config, security/tirith config, timezone, auxiliary models

21 files changed, ~1000 lines added

website/docs/user-guide/cli.md

@@ -94,6 +94,7 @@ When resuming a previous session (`hermes -c` or `hermes --resume <id>`), a "Pre
 | `Ctrl+B` | Start/stop voice recording when voice mode is enabled (`voice.record_key`, default: `ctrl+b`) |
 | `Ctrl+C` | Interrupt agent (double-press within 2s to force exit) |
 | `Ctrl+D` | Exit |
+| `Ctrl+Z` | Suspend Hermes to background (Unix only). Run `fg` in the shell to resume. |
 | `Tab` | Accept auto-suggestion (ghost text) or autocomplete slash commands |
 
 ## Slash Commands
@@ -212,6 +213,33 @@ You can interrupt the agent at any point:
 - In-progress terminal commands are killed immediately (SIGTERM, then SIGKILL after 1s)
 - Multiple messages typed during interrupt are combined into one prompt
 
+### Busy Input Mode
+
+The `display.busy_input_mode` config key controls what happens when you press Enter while the agent is working:
+
+| Mode | Behavior |
+|------|----------|
+| `"interrupt"` (default) | Your message interrupts the current operation and is processed immediately |
+| `"queue"` | Your message is silently queued and sent as the next turn after the agent finishes |
+
+```yaml
+# ~/.hermes/config.yaml
+display:
+  busy_input_mode: "queue"   # or "interrupt" (default)
+```
+
+Queue mode is useful when you want to prepare follow-up messages without accidentally canceling in-flight work. Unknown values fall back to `"interrupt"`.
+
+### Suspending to Background
+
+On Unix systems, press **`Ctrl+Z`** to suspend Hermes to the background — just like any terminal process. The shell prints a confirmation:
+
+```
+Hermes Agent has been suspended. Run `fg` to bring Hermes Agent back.
+```
+
+Type `fg` in your shell to resume the session exactly where you left off. This is not supported on Windows.
+
 ## Tool Progress Display
 
 The CLI shows animated feedback as the agent works:
@@ -232,6 +260,18 @@ The CLI shows animated feedback as the agent works:
 
 Cycle through display modes with `/verbose`: `off → new → all → verbose`. This command can also be enabled for messaging platforms — see [configuration](/docs/user-guide/configuration#display-settings).
 
+### Tool Preview Length
+
+The `display.tool_preview_length` config key controls the maximum number of characters shown in tool call preview lines (e.g. file paths, terminal commands). The default is `0`, which means no limit — full paths and commands are shown.
+
+```yaml
+# ~/.hermes/config.yaml
+display:
+  tool_preview_length: 80   # Truncate tool previews to 80 chars (0 = no limit)
+```
+
+This is useful on narrow terminals or when tool arguments contain very long file paths.
+
 ## Session Management
 
 ### Resuming Sessions