release: Bump version to 1.3.0

Promoting v1.3.0-rc.1 to stable release.

Changes:
- Updated version in starpunk/__init__.py to 1.3.0
- Updated CHANGELOG.md header to v1.3.0

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

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

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [1.3.0-rc.1] - 2025-12-10
+## [1.3.0] - 2025-12-10
 
 ### Added
 

starpunk/__init__.py

@@ -325,5 +325,5 @@ def create_app(config=None):
 
 # Package version (Semantic Versioning 2.0.0)
 # See docs/standards/versioning-strategy.md for details
-__version__ = "1.3.0rc1"
-__version_info__ = (1, 3, 0, "rc", 1)
+__version__ = "1.3.0"
+__version_info__ = (1, 3, 0)