Fix council-team foreign key constraint violation

Problem: Councils couldn't be assigned to tasks because they didn't exist in teams table
- Foreign key constraint tasks_assigned_team_id_fkey required valid team record
- Councils ARE teams (special subtype for project kickoffs)

Solution: Create team record when forming council
- Added team INSERT in storeCouncilComposition()
- Use same UUID for both team.id and council.id
- Team name: 'Council: {ProjectName}'
- ON CONFLICT DO NOTHING for idempotency

Result: Tasks can now be assigned to councils, unblocking task execution

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

internal/council/council_composer.go

@@ -211,6 +211,29 @@ func (cc *CouncilComposer) formatRoleName(roleName string) string {
 
 // storeCouncilComposition stores the council composition in the database
 func (cc *CouncilComposer) storeCouncilComposition(ctx context.Context, composition *CouncilComposition, request *CouncilFormationRequest) error {
+	// First, create a team record for this council (councils ARE teams)
+	teamQuery := `
+		INSERT INTO teams (id, name, description, status, created_at, updated_at)
+		VALUES ($1, $2, $3, $4, $5, $6)
+		ON CONFLICT (id) DO NOTHING
+	`
+
+	teamName := fmt.Sprintf("Council: %s", composition.ProjectName)
+	teamDescription := fmt.Sprintf("Project kickoff council for %s", composition.ProjectName)
+
+	_, err := cc.db.Exec(ctx, teamQuery,
+		composition.CouncilID, // Use same ID for team and council
+		teamName,
+		teamDescription,
+		"forming", // Same status as council
+		composition.CreatedAt,
+		composition.CreatedAt,
+	)
+
+	if err != nil {
+		return fmt.Errorf("failed to create team record for council: %w", err)
+	}
+
 	// Store council metadata
 	councilQuery := `
 		INSERT INTO councils (id, project_name, repository, project_brief, status, created_at, task_id, issue_id, external_url, metadata)
@@ -227,7 +250,7 @@ func (cc *CouncilComposer) storeCouncilComposition(ctx context.Context, composit
 		taskID = request.TaskID
 	}
 
-	_, err := cc.db.Exec(ctx, councilQuery,
+	_, err = cc.db.Exec(ctx, councilQuery,
 		composition.CouncilID,
 		composition.ProjectName,
 		request.Repository,