chore: bump version to 0.33.1

Breaking changes:
- Ephemeral → Wisp rename (JSON field, CLI flag)

Fixes:
- Lint error in mail.go (nosec for mail delegate)

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

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

cmd/bd/version.go

@@ -14,7 +14,7 @@ import (
 
 var (
 	// Version is the current version of bd (overridden by ldflags at build time)
-	Version = "0.33.0"
+	Version = "0.33.1"
 	// Build can be set via ldflags at compile time
 	Build = "dev"
 	// Commit and branch the git revision the binary was built from (optional ldflag)