chore: bump version to 1.4.5 and update changelog

- Update version from 1.4.4 to 1.4.5 in core/__init__.py
- Add comprehensive changelog entry for v1.4.5 with all changes since 1.4.4
- Include enhanced CDM support, caching improvements, and bug fixes

CHANGELOG.md

@@ -5,6 +5,37 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.4.5] - 2025-09-09
+
+### Added
+
+- **Enhanced CDM Key Caching**: Improved key caching and session management for L1/L2 devices
+  - Optimized `get_cached_keys_if_exists` functionality for better performance with L1/L2 devices
+  - Enhanced cached key retrieval logic with improved session handling
+- **Widevine Common Certificate Fallback**: Added fallback to Widevine common certificate for L1 devices
+  - Improved compatibility for L1 devices when service certificates are unavailable
+- **Enhanced Vault Loading**: Improved vault loading and key copying logic
+  - Better error handling and key management in vault operations
+- **PSSH Display Optimization**: Truncated PSSH string display in non-debug mode for cleaner output
+- **CDM Error Messaging**: Added error messages for missing service certificates in CDM sessions
+
+### Changed
+
+- **Dynamic Version Headers**: Updated User-Agent headers to use dynamic version strings
+  - DecryptLabsRemoteCDM now uses dynamic version import instead of hardcoded version
+- **Intelligent CDM Caching**: Implemented intelligent caching system for CDM license requests
+  - Enhanced caching logic reduces redundant license requests and improves performance
+- **Enhanced Tag Handling**: Improved tag handling for TV shows and movies from Simkl data
+  - Better metadata processing and formatting for improved media tagging
+
+### Fixed
+
+- **CDM Session Management**: Clean up session data when retrieving cached keys
+  - Remove decrypt_labs_session_id and challenge from session when cached keys exist but there are missing kids
+  - Ensures clean state for subsequent requests and prevents session conflicts
+- **Tag Formatting**: Fixed formatting issues in tag processing
+- **Import Order**: Fixed import order issues in tags module
+
 ## [1.4.4] - 2025-09-02
 
 ### Added

unshackle/core/__init__.py

@@ -1 +1 @@
-__version__ = "1.4.4"
+__version__ = "1.4.5"

unshackle/core/cdm/decrypt_labs_remote_cdm.py

@@ -11,6 +11,7 @@ from pywidevine.device import DeviceTypes
 from requests import Session
 
 from unshackle.core.vaults import Vaults
+from unshackle.core import __version__
 
 
 class MockCertificateChain:
@@ -150,7 +151,7 @@ class DecryptLabsRemoteCDM:
             {
                 "decrypt-labs-api-key": self.secret,
                 "Content-Type": "application/json",
-                "User-Agent": "unshackle-decrypt-labs-cdm/1.0",
+                "User-Agent": f"unshackle-decrypt-labs-cdm/{__version__}",
             }
         )