chore: bump version to 0.33.0

Ephemeral molecules release:
- bd mol spawn creates ephemeral issues by default
- Ephemeral issues never export to JSONL
- bd mol squash with --summary for agent summaries

🤖 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 +288,18 @@ type VersionChange struct {
 
 // versionChanges contains agent-actionable changes for recent versions
 var versionChanges = []VersionChange{
+	{
+		Version: "0.33.0",
+		Date:    "2025-12-21",
+		Changes: []string{
+			"NEW: Ephemeral molecules (bd-2vh3) - bd mol spawn creates ephemeral issues by default",
+			"NEW: Ephemeral issues live only in SQLite, never export to JSONL (prevents zombie resurrection)",
+			"NEW: --persistent flag on bd mol spawn to opt out of ephemeral spawning",
+			"NEW: bd mol squash compresses ephemeral children into digest issue",
+			"NEW: --summary flag on bd mol squash for agent-provided AI summaries",
+			"FIX: DeleteIssue now cascades to comments table (bd-687g)",
+		},
+	},
 	{
 		Version: "0.32.1",
 		Date:    "2025-12-21",