docs: update assignee examples to use UUID format

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

Author: avivsinai

README.md

@@ -149,7 +149,7 @@ The CLI wraps Bitbucket pull-request endpoints for creation, listing, review, an
 bkt issue list --state open --kind bug           # List open bugs
 bkt issue view 42 --comments                     # View issue with comments
 bkt issue create -t "Login broken" -k bug -p major
-bkt issue edit 42 --assignee alice --priority critical
+bkt issue edit 42 --assignee "{abc-123}" --priority critical
 bkt issue close 42                               # Close an issue
 bkt issue reopen 42                              # Reopen a closed issue
 bkt issue comment 42 -b "Fixed in v1.2.0"        # Add a comment

pkg/cmd/issue/issue.go

@@ -433,8 +433,8 @@ func newCreateCmd(f *cmdutil.Factory) *cobra.Command {
   # Create an enhancement
   bkt issue create -t "Add dark mode" -k enhancement -p minor
 
-  # Create with assignee
-  bkt issue create -t "Fix memory leak" -a johndoe`,
+  # Create with assignee (use UUID from user profile)
+  bkt issue create -t "Fix memory leak" -a "{abc-123-def}"`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runCreate(cmd, f, opts)
 		},