docs: correctness audit — fix wrong values, add missing coverage (#11972)

Comprehensive audit of every reference/messaging/feature doc page against the
live code registries (PROVIDER_REGISTRY, OPTIONAL_ENV_VARS, COMMAND_REGISTRY,
TOOLSETS, tool registry, on-disk skills). Every fix was verified against code
before writing.

### Wrong values fixed (users would paste-and-fail)

- reference/environment-variables.md:
  - DASHSCOPE_BASE_URL default was `coding-intl.dashscope.aliyuncs.com/v1` \u2192
    actual `dashscope-intl.aliyuncs.com/compatible-mode/v1`.
  - MINIMAX_BASE_URL and MINIMAX_CN_BASE_URL defaults were `/v1` \u2192 actual
    `/anthropic` (Hermes calls MiniMax via its Anthropic Messages endpoint).
- reference/toolsets-reference.md MCP example used the non-existent nested
  `mcp: servers:` key \u2192 real key is the flat `mcp_servers:`.
- reference/skills-catalog.md listed ~20 bundled skills that no longer exist
  on disk (all moved to `optional-skills/`). Regenerated the whole bundled
  section from `skills/**/SKILL.md` \u2014 79 skills, accurate paths and names.
- messaging/slack.md ":::info" callout claimed Slack has no
  `free_response_channels` equivalent; both the env var and the yaml key are
  in fact read.
- messaging/qqbot.md documented `QQ_MARKDOWN_SUPPORT` as an env var, but the
  adapter only reads `extra.markdown_support` from config.yaml. Removed the
  env var row and noted config-only nature.
- messaging/qqbot.md `hermes setup gateway` \u2192 `hermes gateway setup`.

### Missing coverage added

- Providers: AWS Bedrock and Qwen Portal (qwen-oauth) \u2014 both in
  PROVIDER_REGISTRY but undocumented everywhere. Added sections to
  integrations/providers.md, rows to quickstart.md and fallback-providers.md.
- integrations/providers.md "Fallback Model" provider list now includes
  gemini, google-gemini-cli, qwen-oauth, xai, nvidia, ollama-cloud, bedrock.
- reference/cli-commands.md `--provider` enum and HERMES_INFERENCE_PROVIDER
  enum in env-vars now include the same set.
- reference/slash-commands.md: added `/agents` (alias `/tasks`) and `/copy`.
  Removed duplicate rows for `/snapshot`, `/fast` (\u00d72), `/debug`.
- reference/tools-reference.md: fixed "47 built-in tools" \u2192 52. Added
  `feishu_doc` and `feishu_drive` toolset sections.
- reference/toolsets-reference.md: added `feishu_doc` / `feishu_drive` core
  rows + all missing `hermes-<platform>` toolsets in the platform table
  (bluebubbles, dingtalk, feishu, qqbot, wecom, wecom-callback, weixin,
  homeassistant, webhook, gateway). Fixed the `debugging` composite to
  describe the actual `includes=[...]` mechanism.
- reference/optional-skills-catalog.md: added `fitness-nutrition`.
- reference/environment-variables.md: added NOUS_BASE_URL,
  NOUS_INFERENCE_BASE_URL, NVIDIA_API_KEY/BASE_URL, OLLAMA_API_KEY/BASE_URL,
  XAI_API_KEY/BASE_URL, MISTRAL_API_KEY, AWS_REGION/AWS_PROFILE,
  BEDROCK_BASE_URL, HERMES_QWEN_BASE_URL, DISCORD_ALLOWED_CHANNELS,
  DISCORD_PROXY, TELEGRAM_REPLY_TO_MODE, MATRIX_DEVICE_ID, MATRIX_REACTIONS,
  QQBOT_HOME_CHANNEL_NAME, QQ_SANDBOX.
- messaging/discord.md: documented DISCORD_ALLOWED_CHANNELS, DISCORD_PROXY,
  HERMES_DISCORD_TEXT_BATCH_DELAY_SECONDS and HERMES_DISCORD_TEXT_BATCH_SPLIT
  _DELAY_SECONDS (all actively read by the adapter).
- messaging/matrix.md: documented MATRIX_REACTIONS (default true).
- messaging/telegram.md: removed the redundant second Webhook Mode section
  that invented a `telegram.webhook_mode: true` yaml key the adapter does
  not read.
- user-guide/features/hooks.md: added `on_session_finalize` and
  `on_session_reset` (both emitted via invoke_hook but undocumented).
- user-guide/features/api-server.md: documented GET /health/detailed, the
  `/api/jobs/*` CRUD surface, POST /v1/runs, and GET /v1/runs/{id}/events
  (10 routes that were live but undocumented).
- user-guide/features/fallback-providers.md: added `approval` and
  `title_generation` auxiliary-task rows; added gemini, bedrock, qwen-oauth
  to the supported-providers table.
- user-guide/features/tts.md: "seven providers" \u2192 "eight" (post-xAI add
  oversight in #11942).
- user-guide/configuration.md: TTS provider enum gains `xai` and `gemini`;
  yaml example block gains `mistral:`, `gemini:`, `xai:` subsections.
  Auxiliary-provider enum now enumerates all real registry entries.
- reference/faq.md: stale AIAgent/config examples bumped from
  `nous/hermes-3-llama-3.1-70b` and `claude-sonnet-4.6` to
  `claude-opus-4.7`.

### Docs-site integrity

- guides/build-a-hermes-plugin.md referenced two nonexistent hooks
  (`pre_api_request`, `post_api_request`). Replaced with the real
  `on_session_finalize` / `on_session_reset` entries.
- messaging/open-webui.md and features/api-server.md had pre-existing
  broken links to `/docs/user-guide/features/profiles` (actual path is
  `/docs/user-guide/profiles`). Fixed.
- reference/skills-catalog.md had one `<1%` literal that MDX parsed as a
  JSX tag. Escaped to `&lt;1%`.

### False positives filtered out (not changed, verified correct)

- `/set-home` is a registered alias of `/sethome` \u2014 docs were fine.
- `hermes setup gateway` is valid syntax (`hermes setup \<section\>`);
  changed in qqbot.md for cross-doc consistency, not as a bug fix.
- Telegram reactions "disabled by default" matches code (default `"false"`).
- Matrix encryption "opt-in" matches code (empty env default \u2192 disabled).
- `pre_api_request` / `post_api_request` hooks do NOT exist in current code;
  documented instead the real `on_session_finalize` / `on_session_reset`.
- SIGNAL_IGNORE_STORIES is already in env-vars.md (subagent missed it).

Validation:
- `docusaurus build` \u2014 passes (only pre-existing nix-setup anchor warning).
- `ascii-guard lint docs` \u2014 124 files, 0 errors.
- 22 files changed, +317 / \u2212158.

website/docs/user-guide/messaging/discord.md

@@ -282,12 +282,16 @@ Discord behavior is controlled through two files: **`~/.hermes/.env`** for crede
 | `DISCORD_ALLOW_BOTS` | No | `"none"` | Controls how the bot handles messages from other Discord bots. `"none"` — ignore all other bots. `"mentions"` — only accept bot messages that `@mention` Hermes. `"all"` — accept all bot messages. |
 | `DISCORD_REACTIONS` | No | `true` | When `true`, the bot adds emoji reactions to messages during processing (👀 when starting, ✅ on success, ❌ on error). Set to `false` to disable reactions entirely. |
 | `DISCORD_IGNORED_CHANNELS` | No | — | Comma-separated channel IDs where the bot **never** responds, even when `@mentioned`. Takes priority over all other channel settings. |
+| `DISCORD_ALLOWED_CHANNELS` | No | — | Comma-separated channel IDs. When set, the bot **only** responds in these channels (plus DMs if allowed). Overrides `config.yaml` `discord.allowed_channels`. Combine with `DISCORD_IGNORED_CHANNELS` to express allow/deny rules. |
 | `DISCORD_NO_THREAD_CHANNELS` | No | — | Comma-separated channel IDs where the bot responds directly in the channel instead of creating a thread. Only relevant when `DISCORD_AUTO_THREAD` is `true`. |
 | `DISCORD_REPLY_TO_MODE` | No | `"first"` | Controls reply-reference behavior: `"off"` — never reply to the original message, `"first"` — reply-reference on the first message chunk only (default), `"all"` — reply-reference on every chunk. |
 | `DISCORD_ALLOW_MENTION_EVERYONE` | No | `false` | When `false` (default), the bot cannot ping `@everyone` or `@here` even if its response contains those tokens. Set to `true` to opt back in. See [Mention Control](#mention-control) below. |
 | `DISCORD_ALLOW_MENTION_ROLES` | No | `false` | When `false` (default), the bot cannot ping `@role` mentions. Set to `true` to allow. |
 | `DISCORD_ALLOW_MENTION_USERS` | No | `true` | When `true` (default), the bot can ping individual users by ID. |
 | `DISCORD_ALLOW_MENTION_REPLIED_USER` | No | `true` | When `true` (default), replying to a message pings the original author. |
+| `DISCORD_PROXY` | No | — | Proxy URL for Discord connections (HTTP, WebSocket, REST). Overrides `HTTPS_PROXY`/`ALL_PROXY`. Supports `http://`, `https://`, and `socks5://` schemes. |
+| `HERMES_DISCORD_TEXT_BATCH_DELAY_SECONDS` | No | `0.6` | Grace window the adapter waits before flushing a queued text chunk. Useful for smoothing streamed output. |
+| `HERMES_DISCORD_TEXT_BATCH_SPLIT_DELAY_SECONDS` | No | `0.1` | Delay between split chunks when a single message exceeds Discord's length limit. |
 
 ### Config File (`config.yaml`)