feat(KB-032): add Planning Mode for AI-assisted task creation

- Add PlanningModeModal component with interactive task planning UI
- Implement backend planning API with /api/planning endpoints
- Add PlanningSession class for managing planning state
- Integrate planning mode into dashboard with header button
- Add comprehensive tests for planning components and API routes
- Include AI agent structure for future planning automation
- Update README with Planning Mode documentation

packages/core/src/index.ts

@@ -1,5 +1,5 @@
 export { COLUMNS, COLUMN_LABELS, COLUMN_DESCRIPTIONS, VALID_TRANSITIONS, DEFAULT_SETTINGS, THINKING_LEVELS, THEME_MODES, COLOR_THEMES } from "./types.js";
-export type { Column, IssueInfo, IssueState, PrInfo, PrStatus, Task, TaskAttachment, TaskCreateInput, TaskDetail, AgentLogEntry, AgentLogType, AgentRole, BoardConfig, MergeResult, Settings, TaskStep, StepStatus, TaskLogEntry, ThinkingLevel, SteeringComment, ThemeMode, ColorTheme } from "./types.js";
+export type { Column, IssueInfo, IssueState, PrInfo, PrStatus, Task, TaskAttachment, TaskCreateInput, TaskDetail, AgentLogEntry, AgentLogType, AgentRole, BoardConfig, MergeResult, Settings, TaskStep, StepStatus, TaskLogEntry, ThinkingLevel, SteeringComment, ThemeMode, ColorTheme, PlanningQuestion, PlanningSummary, PlanningResponse, PlanningQuestionType } from "./types.js";
 export { TaskStore } from "./store.js";
 export { canTransition, getValidTransitions, resolveDependencyOrder } from "./board.js";
 export { 

packages/core/src/types.ts

@@ -331,3 +331,43 @@ export const VALID_TRANSITIONS: Record<Column, Column[]> = {
   done: ["archived"],
   archived: ["done"],
 };
+
+// ── Planning Mode Types ────────────────────────────────────────────────────
+
+/** Type of planning question presented to the user */
+export type PlanningQuestionType = "text" | "single_select" | "multi_select" | "confirm";
+
+/** A single question in the planning conversation flow */
+export interface PlanningQuestion {
+  id: string;
+  type: PlanningQuestionType;
+  question: string;
+  description?: string;
+  options?: Array<{ id: string; label: string; description?: string }>;
+}
+
+/** The final summary generated after planning conversation completes */
+export interface PlanningSummary {
+  title: string;
+  description: string;
+  suggestedSize: "S" | "M" | "L";
+  suggestedDependencies: string[];
+  keyDeliverables: string[];
+}
+
+/** Response from planning endpoints - either a question or the final summary */
+export type PlanningResponse =
+  | { type: "question"; data: PlanningQuestion }
+  | { type: "complete"; data: PlanningSummary };
+
+/** Planning session state stored in memory */
+export interface PlanningSession {
+  id: string;
+  ip: string;
+  initialPlan: string;
+  history: Array<{ question: PlanningQuestion; response: unknown }>;
+  currentQuestion?: PlanningQuestion;
+  summary?: PlanningSummary;
+  createdAt: Date;
+  updatedAt: Date;
+}