feat(server,cli): improve attachment support across issue and comment APIs

- Add --attachment flag to `multica issue create` CLI command
- Fix CreateComment response to include linked attachments instead of empty array
- Include attachments inline in GetIssue API response (matching Jira/ClickUp pattern)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/cmd/multica/cmd_issue.go

@@ -123,6 +123,7 @@ func init() {
 	issueCreateCmd.Flags().String("parent", "", "Parent issue ID")
 	issueCreateCmd.Flags().String("due-date", "", "Due date (RFC3339 format)")
 	issueCreateCmd.Flags().String("output", "json", "Output format: table or json")
+	issueCreateCmd.Flags().StringSlice("attachment", nil, "File path(s) to attach (can be specified multiple times)")
 
 	// issue update
 	issueUpdateCmd.Flags().String("title", "", "New title")
@@ -276,7 +277,13 @@ func runIssueCreate(cmd *cobra.Command, _ []string) error {
 		return err
 	}
 
-	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	// Use a longer timeout when attachments are present (file uploads can be slow).
+	timeout := 15 * time.Second
+	attachments, _ := cmd.Flags().GetStringSlice("attachment")
+	if len(attachments) > 0 {
+		timeout = 60 * time.Second
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
 	defer cancel()
 
 	body := map[string]any{"title": title}
@@ -309,6 +316,19 @@ func runIssueCreate(cmd *cobra.Command, _ []string) error {
 		return fmt.Errorf("create issue: %w", err)
 	}
 
+	// Upload attachments and link them to the newly created issue.
+	issueID := strVal(result, "id")
+	for _, filePath := range attachments {
+		data, readErr := os.ReadFile(filePath)
+		if readErr != nil {
+			return fmt.Errorf("read attachment %s: %w", filePath, readErr)
+		}
+		if _, uploadErr := client.UploadFile(ctx, data, filePath, issueID); uploadErr != nil {
+			return fmt.Errorf("upload attachment %s: %w", filePath, uploadErr)
+		}
+		fmt.Fprintf(os.Stderr, "Uploaded %s\n", filePath)
+	}
+
 	output, _ := cmd.Flags().GetString("output")
 	if output == "table" {
 		headers := []string{"ID", "TITLE", "STATUS", "PRIORITY"}

server/internal/handler/comment.go

@@ -148,7 +148,9 @@ func (h *Handler) CreateComment(w http.ResponseWriter, r *http.Request) {
 		h.linkAttachmentsByIDs(r.Context(), comment.ID, issue.ID, req.AttachmentIDs)
 	}
 
-	resp := commentToResponse(comment, nil, nil)
+	// Fetch linked attachments so the response includes them.
+	groupedAtt := h.groupAttachments(r, []pgtype.UUID{comment.ID})
+	resp := commentToResponse(comment, nil, groupedAtt[uuidToString(comment.ID)])
 	slog.Info("comment created", append(logger.RequestAttrs(r), "comment_id", uuidToString(comment.ID), "issue_id", issueID)...)
 	h.publish(protocol.EventCommentCreated, uuidToString(issue.WorkspaceID), authorType, authorID, map[string]any{
 		"comment":             resp,

server/internal/handler/issue.go

@@ -36,6 +36,7 @@ type IssueResponse struct {
 	CreatedAt          string                  `json:"created_at"`
 	UpdatedAt          string                  `json:"updated_at"`
 	Reactions          []IssueReactionResponse `json:"reactions,omitempty"`
+	Attachments        []AttachmentResponse    `json:"attachments,omitempty"`
 }
 
 type agentTriggerSnapshot struct {
@@ -142,6 +143,18 @@ func (h *Handler) GetIssue(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
+	// Fetch issue-level attachments.
+	attachments, err := h.Queries.ListAttachmentsByIssue(r.Context(), db.ListAttachmentsByIssueParams{
+		IssueID:     issue.ID,
+		WorkspaceID: issue.WorkspaceID,
+	})
+	if err == nil && len(attachments) > 0 {
+		resp.Attachments = make([]AttachmentResponse, len(attachments))
+		for i, a := range attachments {
+			resp.Attachments[i] = h.attachmentToResponse(a)
+		}
+	}
+
 	writeJSON(w, http.StatusOK, resp)
 }