chore: Bump version to 0.30.4

Updated all component versions:
- bd CLI: 0.30.3 → 0.30.4
- Plugin: 0.30.3 → 0.30.4
- MCP server: 0.30.3 → 0.30.4
- npm package: 0.30.3 → 0.30.4

New features:
- bd template instantiate for YAML workflow templates
- --assignee flag for template instantiation
- Fixed mail inbox --identity filtering
- Fixed orphan detection false positives

Note: Graph link edges (relates_to, replies_to, etc.) and mail commands
are experimental and subject to breaking changes.

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

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

CHANGELOG.md

@@ -7,6 +7,34 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.30.4] - 2025-12-18
+
+### Added
+
+- **`bd template instantiate`** (bd-r6a.2) - Create beads issues from YAML workflow templates
+  - `bd template instantiate <file.yaml>` - Create issues from workflow definitions
+  - `--assignee <identity>` flag for auto-assignment during instantiation
+  - Supports multi-issue workflows with dependency chains
+  - Templates define issue properties (title, type, priority, dependencies)
+
+### Changed
+
+- **`bd mail inbox --identity`** - Fixed to properly filter by identity parameter
+
+### Fixed
+
+- **Orphan detection warnings** - No longer warns about closed issues or tombstones
+  - Previously `bd doctor` reported false positives for completed dependencies
+
+### Removed
+
+- **Legacy MCP Agent Mail integration** (bd-6gd) - Removed obsolete `mcp_agents` package
+- **YAML workflow execution system** (bd-r6a.1) - Replaced by simpler template instantiation
+
+### Notes
+
+- **Experimental edges**: The new graph link fields (`relates_to`, `replies_to`, `duplicate_of`, `superseded_by`) and mail commands are **experimental and subject to change** in upcoming releases. Early adopters should expect breaking changes to these APIs.
+
 ## [0.30.3] - 2025-12-17
 
 ### Fixed