Lemenzo Gallery v1.5 — Advanced Production Hardening

Implemented:
- Non-destructive photo editor history with bounded Undo/Redo state.
- Straighten, exposure, tint and local Original/Vivid/Mono/Cool/Warm filters.
- Full-resolution export still replays edits from the original source.
- Metadata-free private sharing by re-encoding into app cache through a read-only grant provider.
- Real lossless-container video trim and mute for MP4-compatible media using MediaExtractor/MediaMuxer; no recompression.
- Viewer edit action now routes images to photo editor and videos to video editor.
- Animated GIF/WebP decode path in viewer with AnimatedImageDrawable support and bitmap fallback.
- Expanded local search tokens for favorites, media origin/type, orientation, 4K, large files, RAW/DNG and HEIC/HEIF.
- Expanded production test gates.

Privacy invariants:
- No INTERNET permission.
- No account, telemetry, analytics, ads or cloud services.
- Original media is never modified by editors.
- Private-share copies are app-cache files and are generated without inherited metadata.

Still requires proof before declaring 100% production ready:
- Android 16/AOSP compile with m LemenzoGallery.
- Runtime tests on each target Pixel/device profile.
- Stress tests on very large photo/video libraries and high-resolution source media.
- Deeper HDR/Ultra HDR, RAW/DNG and Motion Photo compatibility testing against actual Pixel output.
- Vault integration depends on the final Lemenzo Vault contract/API and must not be faked as a local folder.