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/features/cron.md

@@ -193,6 +193,40 @@ When scheduling jobs, you specify where the output goes:
 
 The agent's final response is automatically delivered. You do not need to call `send_message` in the cron prompt.
 
+### Response wrapping
+
+By default, delivered cron output is wrapped with a header and footer so the recipient knows it came from a scheduled task:
+
+```
+Cronjob Response: Morning feeds
+-------------
+
+<agent output here>
+
+Note: The agent cannot see this message, and therefore cannot respond to it.
+```
+
+To deliver the raw agent output without the wrapper, set `cron.wrap_response` to `false`:
+
+```yaml
+# ~/.hermes/config.yaml
+cron:
+  wrap_response: false
+```
+
+### Silent suppression
+
+If the agent's final response starts with `[SILENT]`, delivery is suppressed entirely. The output is still saved locally for audit (in `~/.hermes/cron/output/`), but no message is sent to the delivery target.
+
+This is useful for monitoring jobs that should only report when something is wrong:
+
+```text
+Check if nginx is running. If everything is healthy, respond with only [SILENT].
+Otherwise, report the issue.
+```
+
+Failed jobs always deliver regardless of the `[SILENT]` marker — only successful runs can be silenced.
+
 ## Schedule formats
 
 The agent's final response is automatically delivered — you do **not** need to include `send_message` in the cron prompt for that same destination. If a cron run calls `send_message` to the exact target the scheduler will already deliver to, Hermes skips that duplicate send and tells the model to put the user-facing content in the final response instead. Use `send_message` only for additional or different targets.