diff --git a/frontend/src/lib/components/assistant/AssistantChatPanel.svelte b/frontend/src/lib/components/assistant/AssistantChatPanel.svelte
index c3f62fd2..7dc6219e 100644
--- a/frontend/src/lib/components/assistant/AssistantChatPanel.svelte
+++ b/frontend/src/lib/components/assistant/AssistantChatPanel.svelte
@@ -1,31 +1,31 @@
-<!-- #region AssistantChatPanel [C:3] [TYPE Component] [SEMANTICS assistant, chat, panel, conversation, confirmation] -->
+<!-- #region AssistantChatPanel [C:4] [TYPE Component] [SEMANTICS assistant, chat, panel, conversation, confirmation] -->
 <!-- @ingroup Assistant -->
-<!-- @BRIEF Component component: lib/components/assistant/AssistantChatPanel.svelte -->
+<!-- @BRIEF Assistant chat workspace for mixed-initiative dataset review clarification, contextual actions, and task tracking. -->
 <!-- @LAYER UI -->
+<!-- @PRE Assistant chat store, API adapters, and optional dataset review session context are initialized before the panel becomes interactive. -->
+<!-- @POST User and assistant message state, conversation history, and task affordances stay synchronized with the active conversation scope. -->
+<!-- @SIDE_EFFECT Reads and mutates assistant conversation state, may navigate to review routes, opens task drawer affordances, and emits toast feedback. -->
+<!-- @DATA_CONTRACT Input[{variant,className,assistantChatStore,datasetReviewSessionId?}] → Output[{messages,conversations,conversationId,llmReady,panelVisible}] -->
+<!-- @INVARIANT User commands and assistant responses are appended in chronological order. -->
+<!-- @INVARIANT Risky operations are executed only through explicit confirm action. -->
+<!-- @RELATION BINDS_TO -> [EXT:frontend:assistantChatStore] -->
+<!-- @RELATION BINDS_TO -> [EXT:frontend:datasetReviewSessionStore] -->
+<!-- @RELATION CALLS -> [AssistantApi] -->
+<!-- @RELATION DISPATCHES -> [EXT:frontend:taskDrawerStore] -->
+<!-- @RELATION DEPENDS_ON -> [AssistantClarificationCard] -->
+<!-- @RELATION DEPENDS_ON -> [ToolCallCard] -->
+<!-- @RELATION DEPENDS_ON -> [AgentChatModel] -->
+<!-- @UX_STATE Closed -> Panel is hidden when variant is drawer. -->
+<!-- @UX_STATE Embedded -> Panel mounts inline as the primary workspace canvas. -->
+<!-- @UX_STATE LoadingHistory -> Existing conversation history is loading. -->
+<!-- @UX_STATE Idle -> Input is available and no request in progress. -->
+<!-- @UX_STATE Sending -> Input locked while request is pending. -->
+<!-- @UX_STATE Error -> Failed action rendered as assistant failed message. -->
+<!-- @UX_FEEDBACK Started operation surfaces task_id and quick action to open task drawer. -->
+<!-- @UX_RECOVERY User can retry command or action from input and action buttons. -->
+<!-- @RATIONALE C:3→C:4 upgrade: 33 side-effecting functions (API calls, navigation, store mutations, file I/O) warrant stateful tier. JSDoc duplicates removed (INV_4). Model extraction deferred — AgentChatModel already handles Gradio-powered agent interaction; remaining logic is UI glue (conversation CRUD, file upload, LLM status polling) with no cross-widget invariants that would benefit from a standalone Reactive Screen Model. -->
+<!-- @REJECTED Full Reactive Screen Model rejected — the component delegates agent logic to AgentChatModel (Gradio Client). The remaining 33 functions are conversation lifecycle management (load/create/select/archive) and UI helpers. Extracting these into a separate model would create indirection without reducing cognitive load — the functions directly manipulate local $state atoms with no cross-widget shared invariants. -->
 <script lang="ts">
-  /**
-   * @PURPOSE: Assistant chat workspace for mixed-initiative dataset review clarification, contextual actions, and task tracking.
-   * @LAYER UI
-   * @RELATION BINDS_TO -> assistantChat
-   * @RELATION CALLS -> AssistantApi
-   * @RELATION BINDS_TO -> DatasetReviewWorkspace
-   * @RELATION DISPATCHES -> [EXT:frontend:taskDrawer]
-   * @SEMANTICS: assistant-chat, confirmation, long-running-task, progress-tracking
-   * @PRE: Assistant chat store, API adapters, and optional dataset review session context are initialized before the panel becomes interactive.
-   * @POST: User and assistant message state, conversation history, and task affordances stay synchronized with the active conversation scope.
-   * @SIDE_EFFECT: Reads and mutates assistant conversation state, may navigate to review routes, opens task drawer affordances, and emits toast feedback.
-   * @DATA_CONTRACT: Input[{variant,className,assistantChatStore,datasetReviewSessionId?}] -> Output[{messages,conversations,conversationId,llmReady,panelVisible}]
-   * @INVARIANT: User commands and assistant responses are appended in chronological order.
-   * @INVARIANT: Risky operations are executed only through explicit confirm action.
-   * @UX_STATE: Closed -> Panel is hidden when variant is drawer.
-   * @UX_STATE: Embedded -> Panel mounts inline as the primary workspace canvas.
-   * @UX_STATE: LoadingHistory -> Existing conversation history is loading.
-   * @UX_STATE: Idle -> Input is available and no request in progress.
-   * @UX_STATE: Sending -> Input locked while request is pending.
-   * @UX_STATE: Error -> Failed action rendered as assistant failed message.
-   * @UX_FEEDBACK: Started operation surfaces task_id and quick action to open task drawer.
-   * @UX_RECOVERY: User can retry command or action from input and action buttons.
-   */
 
   import { onMount, onDestroy } from "svelte";
   import { goto } from "$app/navigation";
diff --git a/frontend/src/lib/components/layout/TaskDrawer.svelte b/frontend/src/lib/components/layout/TaskDrawer.svelte
index d577c18f..44e6dda3 100644
--- a/frontend/src/lib/components/layout/TaskDrawer.svelte
+++ b/frontend/src/lib/components/layout/TaskDrawer.svelte
@@ -2,6 +2,12 @@
 <!-- @ingroup Layout -->
 <!-- @BRIEF Global task drawer for monitoring background operations via WebSocket logs, task summaries, and detail views. -->
 <!-- @LAYER UI -->
+<!-- @PRE Task drawer store and optional WebSocket task context are available before detail mode is requested. -->
+<!-- @POST Drawer stays closed, shows the recent-task list, or renders a selected task detail without losing task context. -->
+<!-- @SIDE_EFFECT Opens WebSocket streams, loads recent tasks, and mutates drawer selection state. -->
+<!-- @DATA_CONTRACT TaskDrawerState → RecentTaskList | ActiveTaskDetail -->
+<!-- @INVARIANT Drawer shows logs for active task or remains closed. -->
+<!-- @UX_REACTIVITY Uses $state for local drawer UI and $derived/store subscriptions for active task synchronization. -->
 <!-- @RELATION BINDS_TO -> [EXT:frontend:taskDrawerStore] -->
 <!-- @RELATION BINDS_TO -> [EXT:frontend:assistantChatStore] -->
 <!-- @RELATION DEPENDS_ON -> [TaskLogViewer] -->
@@ -13,45 +19,15 @@
 <!-- @UX_FEEDBACK Close/Back buttons allow navigation. -->
 <!-- @UX_FEEDBACK WebSocket provides real-time log streaming. -->
 <!-- @UX_RECOVERY Click outside or Escape closes drawer. -->
+<!-- @TEST_DATA llm_task_success_with_fail_result -> {"activeTaskDetails":{"plugin_id":"llm_dashboard_validation","status":"SUCCESS","result":{"status":"FAIL"}}} -->
+<!-- @TEST_DATA llm_task_success_with_pass_result -> {"activeTaskDetails":{"plugin_id":"llm_dashboard_validation","status":"SUCCESS","result":{"status":"PASS"}}} -->
+<!-- @TEST_CONTRACT Component_TaskDrawer -> { required_props: {}, optional_props: {}, invariants: ["Binds successfully to taskDrawerStore", "Renders list mode when no activeTaskId is set", "Renders detail mode and websocket stream when activeTaskId is set", "Closes properly on handleClose"] } -->
+<!-- @TEST_FIXTURE init_state -> {} -->
+<!-- @TEST_EDGE empty_task_list -> displays "No recent tasks" -->
+<!-- @TEST_INVARIANT default_rendering -> verifies: [init_state] -->
+<!-- @RATIONALE JSDoc duplicates removed (INV_4). Component consolidates all task-drawer UI logic (WebSocket lifecycles, task list/detail modes, password prompts) into a single C:4 component because the task drawer is a global singleton — extracting subcomponents would scatter the WebSocket lifecycle across files, making reconnect/teardown logic fragile and invisible to the attention mechanism. -->
+<!-- @REJECTED Extracting WebSocket logic into a standalone model was rejected — the WebSocket lifecycle is tightly coupled to drawer open/close transitions and DOM cleanup. A separate model would duplicate $effect cleanup logic and create lifecycle-sync bugs (orphaned WebSocket connections when the drawer is destroyed). Inline $effect with onDestroy guards is the safe pattern for WebSocket teardown. -->
 <script lang="ts">
-  /**
-   * @PURPOSE: Global task drawer for monitoring background operations
-   * @LAYER UI
-   * @RELATION BINDS_TO -> [EXT:frontend:taskDrawer]
-   * @SEMANTICS: TaskLogViewer
-   * @PRE: Task drawer store and optional websocket task context are available before detail mode is requested.
-   * @POST: Drawer stays closed, shows the recent-task list, or renders a selected task detail without losing task context.
-   * @SIDE_EFFECT: Opens websocket streams, loads recent tasks, and mutates drawer selection state.
-   * @DATA_CONTRACT: TaskDrawerState -> RecentTaskList | ActiveTaskDetail
-    * @INVARIANT: Drawer shows logs for active task or remains closed
-   * @UX_REACTIVITY: Uses $state for local drawer UI and $derived or store subscriptions for active task synchronization.
-    *
-    * @UX_STATE: Closed -> Drawer hidden, no active task
-    * @UX_STATE: Open/ListMode -> Drawer visible, showing recent tasks list
-    * @UX_STATE: Open/TaskDetail -> Drawer visible, showing logs for selected task
-   * @UX_STATE: InputRequired -> Interactive form rendered in drawer
-   * @UX_FEEDBACK: Close button allows task to continue running
-   * @UX_FEEDBACK: Back button returns to task list
-   * @UX_RECOVERY: Click outside or X button closes drawer
-   * @UX_RECOVERY: Back button shows task list when viewing task details
-   * @TEST_DATA: llm_task_success_with_fail_result -> {"activeTaskDetails":{"plugin_id":"llm_dashboard_validation","status":"SUCCESS","result":{"status":"FAIL"}}}
-   * @TEST_DATA: llm_task_success_with_pass_result -> {"activeTaskDetails":{"plugin_id":"llm_dashboard_validation","status":"SUCCESS","result":{"status":"PASS"}}}
-   *
-   * @TEST_CONTRACT Component_TaskDrawer ->
-   * {
-   *   required_props: {},
-   *   optional_props: {},
-   *   invariants: [
-   *       "Binds successfully to taskDrawerStore",
-   *       "Renders list mode when no activeTaskId is set",
-   *       "Renders detail mode and websocket stream when activeTaskId is set",
-   *       "Closes properly on handleClose"
-   *   ]
-   * }
-   * @TEST_FIXTURE init_state -> {}
-   * @TEST_EDGE empty_task_list -> displays \"No recent tasks\"
-   * @TEST_INVARIANT default_rendering -> verifies: [init_state]
-   */
 
   import { onDestroy, onMount } from "svelte";
   import { log } from "$lib/cot-logger";
@@ -576,13 +552,9 @@
 
   // #region disconnectWebSocket:Function [TYPE Function]
 // @ingroup Layout
-// @UX_STATE: Loading -> Default
-// @RELATION USES -> [EXT:frontend:App]
-  /**
-   * @PURPOSE: Disconnects the active WebSocket connection
-   * @PRE: ws may or may not be initialized
-   * @POST: ws is closed and set to null
-   */
+// @BRIEF Disconnects the active WebSocket connection.
+// @PRE ws may or may not be initialized.
+// @POST ws is closed and set to null.
   function disconnectWebSocket() {
     log("TaskDrawer", "REASON", "Disconnecting WebSocket");
     if (wsReconnectTimer) {
@@ -600,11 +572,9 @@
 
   // #region loadRecentTasks:Function [TYPE Function]
 // @ingroup Layout
-  /**
-   * @PURPOSE: Load recent tasks for list mode display
-   * @PRE: User is on task drawer or api is ready.
-   * @POST: recentTasks array populated with task list
-   */
+// @BRIEF Load recent tasks for list mode display.
+// @PRE User is on task drawer or API is ready.
+// @POST recentTasks array populated with task list.
   async function loadRecentTasks() {
     loadingTasks = true;
     try {
@@ -624,11 +594,9 @@
 
   // #region selectTask:Function [TYPE Function]
 // @ingroup Layout
-  /**
-   * @PURPOSE: Select a task from list to view details
-   * @PRE: task is a valid task object
-   * @POST: drawer state updated to show task details
-   */
+// @BRIEF Select a task from list to view details.
+// @PRE task is a valid task object.
+// @POST drawer state updated to show task details.
   function selectTask(task) {
     log("TaskDrawer", "REASON", "Select task");
     taskDrawerStore.update((state) => ({
@@ -640,13 +608,9 @@
 
   // #region goBackToList:Function [TYPE Function]
 // @ingroup Layout
-// @UX_STATE: Loading -> Default
-// @RELATION USES -> [EXT:frontend:App]
-  /**
-   * @PURPOSE: Return to task list view from task details
-   * @PRE: Drawer is open and activeTaskId is set
-   * @POST: Drawer switches to list view and reloads tasks
-   */
+// @BRIEF Return to task list view from task details.
+// @PRE Drawer is open and activeTaskId is set.
+// @POST Drawer switches to list view and reloads tasks.
   function goBackToList() {
     log("TaskDrawer", "REASON", "Go back to task list");
     taskDrawerStore.update((state) => ({