docs: comprehensive 2-week sweep of feature/PR coverage gaps (#28497)

Catch the website docs up to two weeks of merged work (May 4 – May 18, 2026,
roughly 1,080 PRs). The audit found ~50 user-visible features that had landed
in code with no docs footprint, plus a handful of stale pages. This PR closes
every gap the scan turned up.

New pages
- user-guide/features/deliverable-mode.md — extension list, agent triggers,
  kanban_complete artifacts pattern, [[as_document]] override (PR #27813).
- developer-guide/web-search-provider-plugin.md — authoring guide modeled on
  image-gen-provider-plugin, covering brave_free / ddgs / etc. (PR #25448).

Providers / auth
- Rename "Alibaba Cloud" → "Qwen Cloud (Alibaba DashScope)" everywhere the
  display label shows up; provider id stays `alibaba` (PR #24835).
- Document OAuth refresh-token quarantine for xAI / MiniMax / Codex (PRs
  #28116 / #28118 / #28119).
- Document Nous JWT minting from refresh token + invalid-refresh quarantine
  + cross-profile shared token store (PRs #27663 / #19712).
- Add `## Microsoft Entra ID authentication (keyless)` section to
  azure-foundry guide — DefaultAzureCredential, RBAC, OpenAI + Anthropic
  routing details (PR #28101 / #9df9816da).
- Custom providers `api_mode` is now prompted-and-persisted, not just URL
  autodetected (PR #25068).
- Delegation honours `api_mode` + auto-detects anthropic_messages base URLs
  (PR #26824).
- `x_search` auto-enables when xAI credentials are present (PR #27376).
- Add `xAI Grok OAuth (SuperGrok)` row to providers headline table (PR
  #26534).
- NVIDIA NIM billing-origin header is set automatically (PR #26585).

Windows / installer
- `install.ps1`: document `-Commit <sha>` and `-Tag <v>` pin params plus
  the BOM-strip / git-retry hardening (PR #28169).
- Document Hermes Desktop thin installer + first-launch bootstrap (PR
  #27822).
- Document `dep_ensure` Windows bootstrap (PR #27845).
- Document install-method auto-detection (pip / git / homebrew / nixos) and
  the matching update command (PR #27843).

Gateway / messaging
- `/platform list|pause|resume` full description + circuit-breaker
  semantics (PR #26600).
- Slack / Matrix / Mattermost get parallel `allowed_channels` /
  `allowed_rooms` allowlist sections matching Telegram/Discord/DingTalk
  (PR #21251).
- Discord `allow_any_attachment` + `max_attachment_bytes` (config and env
  vars) (PR #27245).
- Discord clarify-choice button rendering (PR #25485).
- Telegram `guest_mode` @mention bypass for allowlisted groups (PR
  #22759).
- Telegram `notifications` mode (`important` vs `all`) (PR #22793).
- `[[as_document]]` skill / response directive for forcing
  document-style media delivery (PR #21210).

CLI / TUI
- `/new [name]` argument (PR #19637).
- `/subgoal` user-supplied criteria appended to `/goal` (PR #25449).
- `/exit --delete` flag confirmation prompts for destructive slash
  commands (PR #22687).
- Status-bar additions: ▶ N background indicator (PR #27175), context
  compression count (PR #21218), YOLO mode banner+statusbar warning (PR
  #26238).
- `display.timestamps` + `docker_extra_args` config keys (PR #23599).
- TUI collapsible startup banner sections (PR #20625).
- `HERMES_SESSION_ID` exported to tool subprocesses (PR #23847).

i18n
- Refresh display.language locale list from 8 → 16 (en, zh, zh-hant, ja,
  de, es, fr, tr, uk, af, ko, it, ga, pt, ru, hu) — matches
  `agent/i18n.py:SUPPORTED_LANGUAGES`.

Tools / features
- `vision_analyze` native-pixel passthrough for vision-capable callers,
  with auxiliary text-describer fallback (PR #22955).
- `session_search` rewrite to the single-shape tool (discovery / scroll /
  browse modes) (PRs #27590 / #27840).
- Clarify MCP transport scope: client supports stdio + SSE; embedded
  `hermes mcp serve` is stdio-only (PR #21227).
- Web search backends table: add Brave Search (free tier) and DDGS rows
  (PR #21337).
- ACP session-scoped edit auto-approval modes (PR #27862).
- Curator rename map in the user-visible per-run summary (PR #22910).
- Prompt caching feature page reference in features/overview.md — Claude
  cross-session 1-hour prefix cache on native Anthropic / OpenRouter /
  Nous Portal (PR #23828).
- Cron per-job profile parameter (PR #28124).
- `--no-skills` flag for `hermes profile create` (PR #20986).

Build
- Verified with `npm run build` in `website/`; both `en` and `zh-Hans`
  locales compile. Remaining broken-link/anchor warnings are pre-existing
  (`rl-training.md` from learning-path / overview; the
  zh-Hans translation lag the docs skill already calls out).

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

@@ -944,6 +944,34 @@ TELEGRAM_GROUP_ALLOWED_USERS="-1001234567890"
 TELEGRAM_GROUP_ALLOWED_CHATS="-1001234567890"
 ```
 
+### Guest @mention bypass (`guest_mode`)
+
+In a typical setup, `group_allowed_chats` is a hard gate: messages from groups outside the list are silently dropped, even if a member explicitly @mentions the bot. That's the right default for support / team bots.
+
+For more casual setups — friend group chats where you want the bot **mostly silent** but **occasionally available on explicit ping** — enable `guest_mode`:
+
+```yaml
+gateway:
+  platforms:
+    telegram:
+      extra:
+        group_allowed_chats:
+          - "-1001234567890"   # your main allowlisted group
+        guest_mode: true       # non-allowlisted groups: allow on @mention only
+```
+
+Env equivalent:
+
+```bash
+TELEGRAM_GUEST_MODE=true
+```
+
+Default: `false`.
+
+With `guest_mode: true`, a message from a non-allowlisted group is processed **only** if it explicitly @mentions the bot. The mention is required every turn — there's no session stickiness for guest interactions, so the bot never auto-engages in a friend group thread it isn't pinged into.
+
+DMs and allowlisted groups behave exactly as before.
+
 ## Slash Command Access Control
 
 By default, every allowed user can run every slash command. To split your allowlist into **admins** (full slash command access) and **regular users** (only commands you explicitly enable), add `allow_admin_from` and `user_allowed_commands` to the platform's `extra` block:
@@ -1153,6 +1181,32 @@ Tap a button to answer, or tap **Other** to type a free-form response (the next
 
 Configure the response timeout via `agent.clarify_timeout` in `~/.hermes/config.yaml` (default `600` seconds). If you don't respond within the timeout, the agent unblocks with a sentinel message and adapts rather than hanging.
 
+## Push notification volume
+
+Telegram fires a push notification on every message the bot sends. For long agent turns that emit tool-progress bubbles, streaming updates, and status callbacks, this gets noisy fast. The Telegram adapter has two notification modes:
+
+| Mode | Behavior |
+|------|----------|
+| `important` (default) | Only **final responses**, **approval prompts**, and **slash-command confirmations** ring. Tool progress, streaming chunks, and status messages are delivered with `disable_notification=true`. |
+| `all` | Every outgoing message fires a push notification. Legacy behavior; opt in if you genuinely want to hear about every tool call. |
+
+Configure in `~/.hermes/config.yaml`:
+
+```yaml
+display:
+  platforms:
+    telegram:
+      notifications: important   # or "all"
+```
+
+Env override (handy for quick A/B testing):
+
+```bash
+HERMES_TELEGRAM_NOTIFICATIONS=all
+```
+
+Unknown values log a warning and fall back to `important`.
+
 ## Security
 
 :::warning