fix(dispatch): Filter planning-category tasks from dispatch pipeline and agent context

Planning tasks (research, discuss, plan, detail, refine) have their own
architect flow and should never enter the dispatch pipeline or clutter
agent context. Three changes:

1. Phase auto-queue skips planning-category tasks
2. Safety net in getNextDispatchable() skips planning tasks
3. gatherInitiativeContext() filters to execution tasks only

src/dispatch/manager.ts

@@ -135,6 +135,12 @@ export class DefaultDispatchManager implements DispatchManager {
         continue;
       }
 
+      // Skip planning-category tasks (handled by architect flow)
+      if (task && isPlanningCategory(task.category)) {
+        log.debug({ taskId: qt.taskId, category: task.category }, 'skipping planning-category task');
+        continue;
+      }
+
       readyTasks.push(qt);
     }
 

src/dispatch/phase-manager.ts

@@ -20,7 +20,7 @@ import type { InitiativeRepository } from '../db/repositories/initiative-reposit
 import type { ProjectRepository } from '../db/repositories/project-repository.js';
 import type { BranchManager } from '../git/branch-manager.js';
 import type { PhaseDispatchManager, DispatchManager, QueuedPhase, PhaseDispatchResult } from './types.js';
-import { phaseBranchName } from '../git/branch-naming.js';
+import { phaseBranchName, isPlanningCategory } from '../git/branch-naming.js';
 import { ensureProjectClone } from '../git/project-clones.js';
 import { createModuleLogger } from '../logger/index.js';
 
@@ -191,10 +191,10 @@ export class DefaultPhaseDispatchManager implements PhaseDispatchManager {
     // Remove from queue (now being worked on)
     this.phaseQueue.delete(nextPhase.phaseId);
 
-    // Auto-queue pending tasks for this phase
+    // Auto-queue pending execution tasks for this phase (skip planning-category tasks)
     const phaseTasks = await this.taskRepository.findByPhaseId(nextPhase.phaseId);
     for (const task of phaseTasks) {
-      if (task.status === 'pending') {
+      if (task.status === 'pending' && !isPlanningCategory(task.category)) {
         await this.dispatchManager.queue(task.id);
       }
     }

src/trpc/routers/architect.ts

@@ -18,6 +18,7 @@ import {
   buildRefinePrompt,
   buildDetailPrompt,
 } from '../../agent/prompts/index.js';
+import { isPlanningCategory } from '../../git/branch-naming.js';
 import type { PhaseRepository } from '../../db/repositories/phase-repository.js';
 import type { TaskRepository } from '../../db/repositories/task-repository.js';
 import type { PageRepository } from '../../db/repositories/page-repository.js';
@@ -68,7 +69,10 @@ async function gatherInitiativeContext(
     }
   }
 
-  return { phases, tasks: allTasks, pages };
+  // Only include implementation tasks in agent context — planning tasks are irrelevant noise
+  const implementationTasks = allTasks.filter(t => !isPlanningCategory(t.category));
+
+  return { phases, tasks: implementationTasks, pages };
 }
 
 export function architectProcedures(publicProcedure: ProcedureBuilder) {