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/configuration.md

@@ -140,6 +140,9 @@ terminal:
   docker_volumes:                  # Host directory mounts
     - "/home/user/projects:/workspace/projects"
     - "/home/user/data:/data:ro"   # :ro for read-only
+  docker_extra_args:               # Extra flags appended verbatim to `docker run`
+    - "--gpus=all"
+    - "--network=host"
 
   # Resource limits
   container_cpu: 1                 # CPU cores (0 = unlimited)
@@ -148,6 +151,8 @@ terminal:
   container_persistent: true       # Persist /workspace and /root across sessions
 ```
 
+**`terminal.docker_extra_args`** (also overridable via `TERMINAL_DOCKER_EXTRA_ARGS='["--gpus=all"]'`) lets you pass arbitrary `docker run` flags that Hermes doesn't surface as first-class keys — `--gpus`, `--network`, `--add-host`, alternative `--security-opt` overrides, etc. Each entry must be a string; the list is appended last to the assembled `docker run` invocation so it can override Hermes' defaults if needed. Use sparingly — flags that conflict with the sandbox hardening (capability drops, `--user`, the workspace bind mount) will silently weaken isolation.
+
 **Requirements:** Docker Desktop or Docker Engine installed and running. Hermes probes `$PATH` plus common macOS install locations (`/usr/local/bin/docker`, `/opt/homebrew/bin/docker`, Docker Desktop app bundle). Podman is supported out of the box: set `HERMES_DOCKER_BINARY=podman` (or the full path) to force it when both are installed.
 
 **Container lifecycle:** Hermes reuses a single long-lived container (`docker run -d ... sleep 2h`) for every terminal and file-tool call, across sessions, `/new`, `/reset`, and `delegate_task` subagents, for the lifetime of the Hermes process. Commands run via `docker exec` with a login shell, so working-directory changes, installed packages, and files in `/workspace` all persist from one tool call to the next. The container is stopped and removed on Hermes shutdown (or when the idle-sweep reclaims it).
@@ -762,6 +767,16 @@ credential_pool_strategies:
 
 Options: `fill_first` (default), `round_robin`, `least_used`, `random`. See [Credential Pools](/docs/user-guide/features/credential-pools) for full documentation.
 
+## Prompt caching
+
+Hermes turns on cross-session prompt caching automatically when the active provider supports it — no user config needed.
+
+For Claude on **native Anthropic**, **OpenRouter**, and **Nous Portal**, Hermes attaches `cache_control` breakpoints with the 1-hour TTL (`ttl: "1h"`) on the system prompt and skill blocks. The first send within a fresh hour pays full input rates; subsequent sends across any session within the same hour pull from the cache at the discounted cached-read rate. This means the system prompt, loaded skill content, and the early portion of any long-context include get reused across `hermes` sessions and across forked subagents for the first hour.
+
+The Qwen Cloud (Alibaba DashScope) upstream caps cache TTL at 5 minutes, so Hermes uses the 5-minute breakpoint TTL there instead. Other Claude-via-third-party paths (AWS Bedrock, Azure Foundry) fall back to the provider's own caching defaults. xAI Grok uses a separate session-pinned conversation-id mechanism — see [xAI prompt caching](/docs/integrations/providers#xai-grok--responses-api--prompt-caching).
+
+No knob exists to disable this — caching is always-on and saves money even on single-turn conversations because the system prompt alone is a meaningful fraction of the input token count.
+
 ## Auxiliary Models
 
 Hermes uses "auxiliary" models for side tasks like image analysis, web page summarization, browser screenshot analysis, session-title generation, and context compression. By default (`auxiliary.*.provider: "auto"`), Hermes routes every auxiliary task to your **main chat model** — the same provider/model you picked in `hermes model`. You don't need to configure anything to get started, but be aware that on expensive reasoning models (Opus, MiniMax M2.7, etc.) auxiliary tasks add meaningful cost. If you want cheap-and-fast side tasks regardless of your main model, set `auxiliary.<task>.provider` and `auxiliary.<task>.model` explicitly (for example, Gemini Flash on OpenRouter for vision and web extraction).
@@ -1168,12 +1183,13 @@ display:
   show_reasoning: false   # Show model reasoning/thinking above each response (toggle with /reasoning show|hide)
   streaming: false        # Stream tokens to terminal as they arrive (real-time output)
   show_cost: false        # Show estimated $ cost in the CLI status bar
+  timestamps: false       # When true, prefixes user and assistant labels with [HH:MM] timestamps in the CLI / TUI transcript
   tool_preview_length: 0  # Max chars for tool call previews (0 = no limit, show full paths/commands)
   runtime_footer:         # Gateway: append a runtime-context footer to final replies
     enabled: false
     fields: ["model", "context_pct", "cwd"]
   file_mutation_verifier: true    # Append an advisory footer when write_file/patch calls failed this turn
-  language: en            # UI language for static messages (approval prompts, some gateway replies). en | zh | ja | de | es | fr | tr | uk
+  language: en            # UI language for static messages (approval prompts, some gateway replies). en | zh | zh-hant | ja | de | es | fr | tr | uk | af | ko | it | ga | pt | ru | hu
 ```
 
 ### File-mutation verifier