docs overhaul: agent-facing doc bundle, read-only docs mount in containers

- Strip ~55 stale upstream docs (dev docs never meant for the agents)
- Write new slim index.md as an agent-facing guide to the app's features
- Add new plugin docs: comfyui, elevenlabs, kokoro_tts, orpheus_tts_3b,
  remote_connectivity, whisper_local (replacing old names)
- Add docs_host to UserFs: docs/… and ~/docs/… resolve to {WD}/docs,
  mounted read-only at /root/docs in every user's container
- Instruct assistant/kid/project-coordinator agents to read docs/index.md
  when users ask how the software works

docs/plugins/comfyui.md

@@ -0,0 +1,31 @@
+# ComfyUI
+
+- **Plugin id:** `comfyui`
+- **Category:** Image generation, local
+- **Runs:** talks to a separately-running ComfyUI server over HTTP (default `http://localhost:8188`)
+
+## What it does
+
+Turns a locally running [ComfyUI](https://github.com/comfyanonymous/ComfyUI) installation into one or more image-generation models the assistant can call. Every JSON workflow file dropped into a watched folder becomes its own selectable model — so a user can have separate "photo-realistic", "anime", "upscale" etc. workflows, each showing up independently.
+
+The plugin polls the ComfyUI server every 5 seconds. If it's offline, every model built from it disappears until it comes back; if a workflow file is added, edited, or removed, the model list updates live — no restart needed.
+
+## Requirements
+
+- ComfyUI installed and running somewhere reachable from this machine (its own GPU-heavy install, not something this app manages).
+- At least one workflow exported from ComfyUI as a JSON API file, containing a `CLIPTextEncode` node (for text-to-image) and/or an image-loading node (for image-to-image). Advanced workflows can add a `_personal_agent` metadata block inside the JSON to control exactly which node/field receives the prompt, negative prompt, width/height/steps, and input image — without that block the plugin auto-detects the first `CLIPTextEncode` node.
+
+## Enabling & configuring (admin)
+
+1. Plugin catalog → **ComfyUI** → enable, then **Configure**.
+2. Fields:
+   - **`base_url`** (default `http://localhost:8188`) — where ComfyUI's API is listening.
+   - **`workflows_dir`** (default `data/comfyui/workflows`) — folder to watch for `.json` workflow files. Created automatically if missing.
+   - **`default_negative`** — an optional negative prompt applied to every workflow that has a negative-prompt node.
+3. Put workflow JSON files in the workflows folder. Each becomes a model named after the file (or the `name` given in its `_personal_agent` block) in the **Image generation** section of the Models hub — no separate "add provider" step, since this plugin registers its models directly.
+
+## Notes
+
+- A single generation can take up to 5 minutes before the plugin times out and reports an error.
+- Image-to-image is supported when the workflow declares an `input_image_node` in `_personal_agent`.
+- If ComfyUI is unreachable, tell the user to start their ComfyUI server — there is nothing to fix in this app's configuration in that case.