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/info.go

@@ -288,6 +288,15 @@ type VersionChange struct {
 
 // versionChanges contains agent-actionable changes for recent versions
 var versionChanges = []VersionChange{
+	{
+		Version: "0.33.1",
+		Date:    "2025-12-21",
+		Changes: []string{
+			"BREAKING: Ephemeral → Wisp rename - JSON field changed from 'ephemeral' to 'wisp'",
+			"BREAKING: CLI flag changed from --ephemeral to --wisp (bd cleanup)",
+			"NOTE: SQLite column remains 'ephemeral' (no migration needed)",
+		},
+	},
 	{
 		Version: "0.33.0",
 		Date:    "2025-12-21",