fix: Resolve 3 P1 bugs and add --body-file flag to bd create

- bd-06px: Add --no-git-history flag to import command for sync subprocess compatibility
- bd-0zp7: Add missing hook calls (EventMessage in mail reply, EventClose in mail ack)
- bd-hy9p: Implement --body-file and --description-file flags for reading descriptions from files

Also closed stale issues that were already fixed:
- bd-0d5p: macOS test timeout (already fixed with SysProcAttr)
- bd-7yg: Merge driver placeholders (already using correct %A %O %A %B)
- bd-4ri: Test deadlock (test passes in 0.04s now)
- bd-b3og: TestImportBugIntegration (test no longer exists)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/flags.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -13,18 +14,57 @@ func registerCommonIssueFlags(cmd *cobra.Command) {
 	cmd.Flags().StringP("description", "d", "", "Issue description")
 	cmd.Flags().String("body", "", "Alias for --description (GitHub CLI convention)")
 	_ = cmd.Flags().MarkHidden("body") // Hidden alias for agent/CLI ergonomics
+	cmd.Flags().String("body-file", "", "Read description from file (use - for stdin)")
+	cmd.Flags().String("description-file", "", "Alias for --body-file")
+	_ = cmd.Flags().MarkHidden("description-file") // Hidden alias
 	cmd.Flags().String("design", "", "Design notes")
 	cmd.Flags().String("acceptance", "", "Acceptance criteria")
 	cmd.Flags().String("external-ref", "", "External reference (e.g., 'gh-9', 'jira-ABC')")
 }
 
-// getDescriptionFlag retrieves the description value, checking both --description and --body.
-// Returns the value and whether either flag was explicitly changed.
+// getDescriptionFlag retrieves the description value, checking --body-file, --description-file,
+// --description, and --body (in that order of precedence).
+// Returns the value and whether any flag was explicitly changed.
 func getDescriptionFlag(cmd *cobra.Command) (string, bool) {
+	bodyFileChanged := cmd.Flags().Changed("body-file")
+	descFileChanged := cmd.Flags().Changed("description-file")
 	descChanged := cmd.Flags().Changed("description")
 	bodyChanged := cmd.Flags().Changed("body")
 
-	// Error if both are specified with different values
+	// Check for conflicting file flags
+	if bodyFileChanged && descFileChanged {
+		bodyFile, _ := cmd.Flags().GetString("body-file")
+		descFile, _ := cmd.Flags().GetString("description-file")
+		if bodyFile != descFile {
+			fmt.Fprintf(os.Stderr, "Error: cannot specify both --body-file and --description-file with different values\n")
+			os.Exit(1)
+		}
+	}
+
+	// File flags take precedence over string flags
+	if bodyFileChanged || descFileChanged {
+		var filePath string
+		if bodyFileChanged {
+			filePath, _ = cmd.Flags().GetString("body-file")
+		} else {
+			filePath, _ = cmd.Flags().GetString("description-file")
+		}
+
+		// Error if both file and string flags are specified
+		if descChanged || bodyChanged {
+			fmt.Fprintf(os.Stderr, "Error: cannot specify both --body-file and --description/--body\n")
+			os.Exit(1)
+		}
+
+		content, err := readBodyFile(filePath)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Error reading body file: %v\n", err)
+			os.Exit(1)
+		}
+		return content, true
+	}
+
+	// Error if both description and body are specified with different values
 	if descChanged && bodyChanged {
 		desc, _ := cmd.Flags().GetString("description")
 		body, _ := cmd.Flags().GetString("body")
@@ -46,6 +86,30 @@ func getDescriptionFlag(cmd *cobra.Command) (string, bool) {
 	return desc, descChanged
 }
 
+// readBodyFile reads the description content from a file.
+// If filePath is "-", reads from stdin.
+func readBodyFile(filePath string) (string, error) {
+	var reader io.Reader
+
+	if filePath == "-" {
+		reader = os.Stdin
+	} else {
+		file, err := os.Open(filePath)
+		if err != nil {
+			return "", fmt.Errorf("failed to open file: %w", err)
+		}
+		defer file.Close()
+		reader = file
+	}
+
+	content, err := io.ReadAll(reader)
+	if err != nil {
+		return "", fmt.Errorf("failed to read file: %w", err)
+	}
+
+	return string(content), nil
+}
+
 // registerPriorityFlag registers the priority flag with a specific default value.
 func registerPriorityFlag(cmd *cobra.Command, defaultVal string) {
 	cmd.Flags().StringP("priority", "p", defaultVal, "Priority (0-4 or P0-P4, 0=highest)")