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* Layered TIFF: open and save Photoshop layer data in TIFF files, in either byte order (part of #215) Photoshop keeps a layered TIFF's layers in two private tags: 37724 (ImageSourceData, the same layer section a PSD has) and 34377 (the image resources). PhotoCraft now reads and writes both, so a TIFF opens with its groups, masks, layer styles, type, shapes, smart objects and adjustment layers exactly as the PSD path would, and saves them back. * photocraft-psd: a `tiff` module with `ImageSourceData` (parse/write, PSD- and PSB-sized), the 34377 resource helpers, and a field-by-field byte-order transcoder. In Intel-order TIFFs Photoshop byte-swaps the whole block structure (reversed keys, little-endian integers and doubles) while pixel samples stay big-endian; the transcoder knows the layer-info structure, masks, blending ranges and every block photocraft-io maps (descriptors, TySh, lrFX, the binary adjustments, paths, patterns, filter effects, metadata settings, linked layers, annotations...), recognizes descriptor-shaped unknown blocks, and drops the rest with a warning instead of passing byte-swapped data to other readers. The reader gained an optional little-endian mode. 23 unit tests; a fuzz target in the CI matrix. * photocraft-codecs: the two tags travel as opaque bytes on `Metadata`, read by a bounds-checked walk of IFD0 (classic and BigTIFF, both byte orders) and written back as BYTE / UNDEFINED tags. `tiff_writes_little_endian()` tells which order the encoder produces. * photocraft-io: `tiff_layers` rebuilds a PSD model from the TIFF's pixels plus the tags on import, and on export runs the PSD exporter (new `merged_matte` / `merged_compression` options), interleaves its merged planes for the TIFF image and stores the layer section in the encoder's byte order. `ExportOptions.tiff_layers` (default on). Lab and Multichannel documents save flat; extra alpha channels are not written (one transparency sample). * UI: the TIFF Options prompt ("Including layers will increase file size." / "Discard Layers and Save a Copy" / "Don't show again") behind Preferences > File Handling > Ask Before Saving Layered TIFF Files; `ExportSettings.tiff_layers`; catalogs updated. * Tests: io round trips at 8/16/32 bits in Gray/RGB/CMYK, equivalence with the PSD path, every TIFF compression, the flat fall-backs, malformed input, and files written by psdtags in both byte orders (fixtures from scripts/layered_tiff_fixtures.py); a corpus test (feature `corpus`) writes every corpus PSD as a layered TIFF and compares the result with the PSD round trip (700 files, 0 differences, 0 crashes). Codecs tests cover the tag walk on hand-made files. * Scorecard FILE-215-7 done, BUG-204-3 partial; README and book updated. Co-Authored-By: Claude Mythos 5.1 <noreply@anthropic.com> * Layered TIFF: de and pt-br strings; neutral wording in the psd tiff docs The four psdtags fixtures stay out of the repository (no binary test data here): the generator now writes them to the gitignored corpus/layered-tiff/, and the tests that read them skip with a message when absent. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Regenerate docs/scorecard.md Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: leon <claude.udder842@passmail.net> Co-authored-by: Claude Mythos 5.1 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>