chore: Bump version to 0.19.0

Release highlights:
- Fix bd-160: JSONL integrity validation prevents export deduplication data loss
- Add comprehensive integration tests for export/import workflows
- Clear export_hashes on imports to prevent staleness
- Created bd-179 epic for remaining test coverage improvements

This release fixes a critical P0 bug that could cause silent data loss
when JSONL and export_hashes diverged after git operations.

integrations/beads-mcp/pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "beads-mcp"
-version = "0.18.0"
+version = "0.19.0"
 description = "MCP server for beads issue tracker."
 readme = "README.md"
 requires-python = ">=3.10"

integrations/beads-mcp/src/beads_mcp/__init__.py

@@ -4,4 +4,4 @@ This package provides an MCP (Model Context Protocol) server that exposes
 beads (bd) issue tracker functionality to MCP Clients.
 """
 
-__version__ = "0.18.0"
+__version__ = "0.19.0"