Adds TUI prompt traits, refs, and plugin slots (#20741)

packages/opencode/specs/tui-plugins.md

@@ -194,9 +194,9 @@ That is what makes local config-scoped plugins able to import `@opencode-ai/plug
 Top-level API groups exposed to `tui(api, options, meta)`:
 
 - `api.app.version`
-- `api.command.register(cb)` / `api.command.trigger(value)`
+- `api.command.register(cb)` / `api.command.trigger(value)` / `api.command.show()`
 - `api.route.register(routes)` / `api.route.navigate(name, params?)` / `api.route.current`
-- `api.ui.Dialog`, `DialogAlert`, `DialogConfirm`, `DialogPrompt`, `DialogSelect`, `Prompt`, `ui.toast`, `ui.dialog`
+- `api.ui.Dialog`, `DialogAlert`, `DialogConfirm`, `DialogPrompt`, `DialogSelect`, `Slot`, `Prompt`, `ui.toast`, `ui.dialog`
 - `api.keybind.match`, `print`, `create`
 - `api.tuiConfig`
 - `api.kv.get`, `set`, `ready`
@@ -225,6 +225,7 @@ Command behavior:
 - Registrations are reactive.
 - Later registrations win for duplicate `value` and for keybind handling.
 - Hidden commands are removed from the command dialog and slash list, but still respond to keybinds and `command.trigger(value)` if `enabled !== false`.
+- `api.command.show()` opens the host command dialog directly.
 
 ### Routes
 
@@ -242,7 +243,8 @@ Command behavior:
 
 - `ui.Dialog` is the base dialog wrapper.
 - `ui.DialogAlert`, `ui.DialogConfirm`, `ui.DialogPrompt`, `ui.DialogSelect` are built-in dialog components.
-- `ui.Prompt` renders the same prompt component used by the host app.
+- `ui.Slot` renders host or plugin-defined slots by name from plugin JSX.
+- `ui.Prompt` renders the same prompt component used by the host app and accepts `sessionID`, `workspaceID`, `ref`, and `right` for the prompt meta row's right side.
 - `ui.toast(...)` shows a toast.
 - `ui.dialog` exposes the host dialog stack:
   - `replace(render, onClose?)`
@@ -315,8 +317,12 @@ Current host slot names:
 
 - `app`
 - `home_logo`
-- `home_prompt` with props `{ workspace_id? }`
+- `home_prompt` with props `{ workspace_id?, ref? }`
+- `home_prompt_right` with props `{ workspace_id? }`
+- `session_prompt` with props `{ session_id, visible?, disabled?, on_submit?, ref? }`
+- `session_prompt_right` with props `{ session_id }`
 - `home_bottom`
+- `home_footer`
 - `sidebar_title` with props `{ session_id, title, share_url? }`
 - `sidebar_content` with props `{ session_id }`
 - `sidebar_footer` with props `{ session_id }`
@@ -328,8 +334,8 @@ Slot notes:
 - `api.slots.register(plugin)` does not return an unregister function.
 - Returned ids are `pluginId`, `pluginId:1`, `pluginId:2`, and so on.
 - Plugin-provided `id` is not allowed.
-- The current host renders `home_logo` and `home_prompt` with `replace`, `sidebar_title` and `sidebar_footer` with `single_winner`, and `app`, `home_bottom`, and `sidebar_content` with the slot library default mode.
-- Plugins cannot define new slot names in this branch.
+- The current host renders `home_logo`, `home_prompt`, and `session_prompt` with `replace`, `home_footer`, `sidebar_title`, and `sidebar_footer` with `single_winner`, and `app`, `home_prompt_right`, `session_prompt_right`, `home_bottom`, and `sidebar_content` with the slot library default mode.
+- Plugins can define custom slot names in `api.slots.register(...)` and render them from plugin UI with `ui.Slot`.
 
 ### Plugin control and lifecycle
 
@@ -425,5 +431,6 @@ The plugin manager is exposed as a command with title `Plugins` and value `plugi
 ## Current in-repo examples
 
 - Local smoke plugin: `.opencode/plugins/tui-smoke.tsx`
+- Local vim plugin: `.opencode/plugins/tui-vim.tsx`
 - Local smoke config: `.opencode/tui.json`
 - Local smoke theme: `.opencode/plugins/smoke-theme.json`