bump version to 1.3.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: terraboops

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "trellis"
-version = "1.2.0"
+version = "1.3.0"
 description = "Agentic pipeline platform — design agent teams that take ideas from concept to launch"
 license = "Apache-2.0"
 requires-python = ">=3.12"