fix: Complete memory leak fix with shortcode context tracking

The v0.4.1 fix was incomplete - shortcodes called get_*_data() methods
directly, bypassing the recursion tracking in get_post_data().

Changes:
- Added $in_shortcode_context flag to TemplateLoader
- Added enter/exit_shortcode_context() methods
- All shortcode render methods now enter context before data loading
- When in shortcode context, the_content filter is always skipped

This fully prevents infinite recursion when post content contains
FediStream shortcodes that would otherwise recursively render.

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

CHANGELOG.md

@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.2] - 2026-02-02
+
+### Fixed
+
+- **Complete fix for memory leak** - v0.4.1 fix was incomplete
+  - Added `$in_shortcode_context` flag to TemplateLoader to track when we're rendering shortcodes
+  - All shortcode render methods now call `enter_shortcode_context()` before loading data
+  - When in shortcode context, `the_content` filter is always skipped to prevent recursive shortcode processing
+  - This prevents infinite recursion when post content contains FediStream shortcodes
+
 ## [0.4.1] - 2026-02-02
 
 ### Fixed
@@ -207,7 +217,8 @@ Initial release of WP FediStream - a WordPress plugin for streaming music over A
 
 ---
 
-[Unreleased]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.1...HEAD
+[Unreleased]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.2...HEAD
+[0.4.2]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.1...v0.4.2
 [0.4.1]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.0...v0.4.1
 [0.4.0]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.3.0...v0.4.0
 [0.3.0]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.2.0...v0.3.0