feat: add --notes flag to bd create command (GH#830)

Add --notes flag to bd create command, enabling agents to set notes
during issue creation instead of requiring a separate update command.

Motivation: AI agents repeatedly tried to use --notes with bd create.
Context is fresh at creation time - forcing a two-step process means
context loss or workflow interruption.

Changes:
- cmd/bd/flags.go: Added --notes flag to common issue flags
- cmd/bd/create.go: Read and pass notes in both RPC and direct modes
- cmd/bd/update.go: Removed duplicate --notes flag definition
- internal/rpc/protocol.go: Added Notes field to CreateArgs
- internal/rpc/server_issues_epics.go: Process Notes in handleCreate
- cmd/bd/create_notes_test.go: Comprehensive test coverage
- website/docs/cli-reference/issues.md: Documentation

Also adds gitignore entries for Augment AI and .beads/redirect.

Co-authored-by: Leon Letto <lettol@vmware.com>

cmd/bd/update.go

@@ -414,7 +414,6 @@ func init() {
 	updateCmd.Flags().String("title", "", "New title")
 	updateCmd.Flags().StringP("type", "t", "", "New type (bug|feature|task|epic|chore|merge-request|molecule|gate)")
 	registerCommonIssueFlags(updateCmd)
-	updateCmd.Flags().String("notes", "", "Additional notes")
 	updateCmd.Flags().String("acceptance-criteria", "", "DEPRECATED: use --acceptance")
 	_ = updateCmd.Flags().MarkHidden("acceptance-criteria") // Only fails if flag missing (caught in tests)
 	updateCmd.Flags().IntP("estimate", "e", 0, "Time estimate in minutes (e.g., 60 for 1 hour)")