feat(KB-139): parse dependencies, size, and review level from PROMPT.md after triage

- Add parseDependenciesFromPrompt to TaskStore to extract task IDs from ## Dependencies section
- Call dependency parser in specifyTask after PROMPT.md is written by triage agent
- Extract size (S/M/L) and review level from PROMPT.md front-matter into task metadata
- Extend updateTask to accept size and reviewLevel fields
- Add comprehensive tests for dependency parsing and triage integration

packages/core/src/store.test.ts

@@ -658,6 +658,105 @@ describe("TaskStore", () => {
     });
   });
 
+  describe("parseDependenciesFromPrompt", () => {
+    it("returns single dependency from PROMPT.md", async () => {
+      const task = await store.createTask({ description: "Task with dep" });
+      const dir = join(rootDir, ".kb", "tasks", task.id);
+      await writeFile(
+        join(dir, "PROMPT.md"),
+        `# ${task.id}: Task with dep
+
+## Dependencies
+
+- **Task:** KB-001 (must be complete first)
+
+## Steps
+
+### Step 0: Preflight
+- [ ] Check things
+`,
+      );
+
+      const deps = await store.parseDependenciesFromPrompt(task.id);
+      expect(deps).toEqual(["KB-001"]);
+    });
+
+    it("returns multiple dependencies in order", async () => {
+      const task = await store.createTask({ description: "Task with deps" });
+      const dir = join(rootDir, ".kb", "tasks", task.id);
+      await writeFile(
+        join(dir, "PROMPT.md"),
+        `# ${task.id}: Task with deps
+
+## Dependencies
+
+- **Task:** KB-010 (first dep)
+- **Task:** KB-020 (second dep)
+- **Task:** PROJ-003 (third dep)
+
+## Steps
+
+### Step 0: Preflight
+- [ ] Check things
+`,
+      );
+
+      const deps = await store.parseDependenciesFromPrompt(task.id);
+      expect(deps).toEqual(["KB-010", "KB-020", "PROJ-003"]);
+    });
+
+    it("returns empty array when dependencies section says None", async () => {
+      const task = await store.createTask({ description: "No deps" });
+      const dir = join(rootDir, ".kb", "tasks", task.id);
+      await writeFile(
+        join(dir, "PROMPT.md"),
+        `# ${task.id}: No deps
+
+## Dependencies
+
+- **None**
+
+## Steps
+
+### Step 0: Preflight
+- [ ] Check things
+`,
+      );
+
+      const deps = await store.parseDependenciesFromPrompt(task.id);
+      expect(deps).toEqual([]);
+    });
+
+    it("returns empty array when no Dependencies section exists", async () => {
+      const task = await store.createTask({ description: "No section" });
+      const dir = join(rootDir, ".kb", "tasks", task.id);
+      await writeFile(
+        join(dir, "PROMPT.md"),
+        `# ${task.id}: No section
+
+## Steps
+
+### Step 0: Preflight
+- [ ] Check things
+`,
+      );
+
+      const deps = await store.parseDependenciesFromPrompt(task.id);
+      expect(deps).toEqual([]);
+    });
+
+    it("returns empty array when task has no PROMPT.md file", async () => {
+      const task = await store.createTask({ description: "No prompt" });
+      const dir = join(rootDir, ".kb", "tasks", task.id);
+      // Delete the PROMPT.md that createTask generates
+      const { unlink } = await import("node:fs/promises");
+      await unlink(join(dir, "PROMPT.md"));
+
+      const deps = await store.parseDependenciesFromPrompt(task.id);
+      expect(deps).toEqual([]);
+    });
+  });
+
   describe("columnMovedAt", () => {
     it("createTask sets columnMovedAt", async () => {
       const before = new Date().toISOString();

packages/core/src/store.ts

@@ -287,7 +287,7 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
 
   async updateTask(
     id: string,
-    updates: { title?: string; description?: string; prompt?: string; worktree?: string; status?: string | null; dependencies?: string[]; blockedBy?: string | null; paused?: boolean; baseBranch?: string },
+    updates: { title?: string; description?: string; prompt?: string; worktree?: string; status?: string | null; dependencies?: string[]; blockedBy?: string | null; paused?: boolean; baseBranch?: string; size?: "S" | "M" | "L"; reviewLevel?: number },
   ): Promise<Task> {
     return this.withTaskLock(id, async () => {
       const dir = this.taskDir(id);
@@ -309,6 +309,8 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
       }
       if (updates.paused !== undefined) task.paused = updates.paused || undefined;
       if (updates.baseBranch !== undefined) task.baseBranch = updates.baseBranch;
+      if (updates.size !== undefined) task.size = updates.size;
+      if (updates.reviewLevel !== undefined) task.reviewLevel = updates.reviewLevel;
       task.updatedAt = new Date().toISOString();
 
       await this.atomicWriteTaskJson(dir, task);
@@ -448,6 +450,44 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
     return steps;
   }
 
+  /**
+   * Parse the `## Dependencies` section from a task's PROMPT.md and extract
+   * task IDs from lines matching `- **Task:** {ID}` (where ID is `[A-Z]+-\d+`).
+   *
+   * Returns an empty array if the section says `- **None**`, has no task
+   * references, or if the section/file doesn't exist.
+   *
+   * @param id - The task ID whose PROMPT.md to parse
+   * @returns Array of dependency task IDs (e.g. `["KB-001", "KB-002"]`)
+   */
+  async parseDependenciesFromPrompt(id: string): Promise<string[]> {
+    const dir = this.taskDir(id);
+    const promptPath = join(dir, "PROMPT.md");
+    if (!existsSync(promptPath)) return [];
+
+    const content = await readFile(promptPath, "utf-8");
+
+    // Find the ## Dependencies section.
+    // We locate the heading then slice to the next heading (or end of file)
+    // to avoid multiline `$` anchor issues with lazy quantifiers.
+    const headingMatch = content.match(/^##\s+Dependencies\s*$/m);
+    if (!headingMatch) return [];
+
+    const startIdx = headingMatch.index! + headingMatch[0].length;
+    const rest = content.slice(startIdx);
+    const nextHeading = rest.search(/\n##?\s/);
+    const section = nextHeading === -1 ? rest : rest.slice(0, nextHeading);
+
+    const ids: string[] = [];
+    const taskIdRegex = /^-\s+\*\*Task:\*\*\s+([A-Z]+-\d+)/gm;
+    let match;
+    while ((match = taskIdRegex.exec(section)) !== null) {
+      ids.push(match[1]);
+    }
+
+    return ids;
+  }
+
   /**
    * Parse the `## File Scope` section from a task's PROMPT.md and extract
    * backtick-quoted file paths. Glob patterns ending in `/*` are stored