fix: resolve integration issues after phase branch merges

- Register errandProcedures in appRouter (was defined but never spread)
- Fix nullable projectId guard in errand delete/abandon procedures
- Add sendUserMessage stub to MockAgentManager in headquarters and
  radar-procedures tests (AgentManager interface gained this method)
- Add missing qualityReview field to Initiative fixture in file-io test
  (schema gained this column from the quality-review phase)
- Cast conflictFiles access in CLI errand resolve command

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/server/agent/file-io.test.ts

@@ -52,6 +52,7 @@ describe('writeInputFiles', () => {
       status: 'active',
       branch: 'cw/test-initiative',
       executionMode: 'review_per_phase',
+      qualityReview: false,
       createdAt: new Date('2026-01-01'),
       updatedAt: new Date('2026-01-02'),
     };