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

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

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.33.0] - 2025-12-21
+
 ### Added
 
 - **Ephemeral molecules** (bd-2vh3) - Spawn molecules as ephemeral by default