Add measured auto engine selection

data/evaluations/engine-selection/README.md

@@ -0,0 +1,61 @@
+# Engine-selection fixture set
+
+This directory is the tracked, content-balanced input set for researching a
+deterministic `auto` engine choice. It is not a training corpus and it is not a
+watermark-oracle corpus.
+
+## Content matrix
+
+`content-manifest.csv` contains 19 prompt-matched pairs. Each pair uses the
+same prompt and generation index across OpenAI `gpt-image-1-mini` and Meta
+`muse-image-1.0`, covering the content classes that materially stress image
+regeneration:
+
+- natural and urban scenes;
+- single-person portraits and people in context;
+- animals, food, products, interiors, architecture, macro detail, and action;
+- flat, isometric, watercolor, and surreal illustration styles.
+
+The files are exact copies of generation outputs collected for the
+`docs/arxiv-paper-review` research branch. The manifest records the SHA-256 of
+the committed bytes. The old OpenAI collection manifest stored the API payload
+hash under `sha256`; `source_payload_sha256` preserves that value while
+`sha256` always means the actual file bytes here. Meta's two hashes are the
+same.
+
+One generation per prompt and provider is enough for the first paired
+discovery pass. Any policy inferred from it must be challenged against unused
+generation indices from the local research archive before shipping. Generated
+outputs belong outside this directory.
+
+`carrier-manifest.csv` adds the canonical, already tracked signal carriers to
+the study without copying their bytes. Together the two manifests cover
+ordinary content, text, single faces, face grids, and mixed face/text scenes.
+
+## Signal carriers
+
+The content matrix was re-encoded by its collection pipeline and has no local
+provenance signal. It must not be used to set or certify watermark-removal
+strengths. The tracked oracle/carrier inputs remain in their canonical homes:
+
+- OpenAI and Google SynthID: `data/synthid/originals/` with
+  `data/synthid/manifest.csv`;
+- Meta Content Seal: `data/contentseal/originals/` with
+  `data/contentseal/manifest.csv`.
+
+There is no tracked, publication-cleared Microsoft InvisMark carrier yet. The
+three Paint sources used by the earlier calibration are user uploads and remain
+outside git. A Microsoft row may be added only from a newly generated or
+otherwise publication-cleared source, with a pixel-identical metadata-stripped
+control that remains positive in Microsoft's detector.
+
+## Integrity check
+
+Run:
+
+```bash
+uv run python scripts/verify_engine_selection_fixtures.py
+```
+
+The check validates paths, byte hashes, dimensions, prompt pairing, and the
+declared provider/content matrix without loading any ML model.

data/evaluations/engine-selection/carrier-manifest.csv

@@ -0,0 +1,13 @@
+provider,file,content_stratum,signal,verified_via,sha256,verified_text_geometry,verified_text_ground_truth
+openai,"../../synthid/originals/ChatGPT Image May 30, 2026, 10_31_08 AM.png",face_grid,OpenAI SynthID,openai-verify,28ff8732b037f98a4ef5bc277bbcdaa32e5eb9ccbd00b6c8c616e46ef68ae8a0,no,no
+openai,"../../synthid/originals/ChatGPT Image May 31, 2026, 02_02_23 PM.png",multilingual_typography,OpenAI SynthID,c2pa-metadata,228e54413a3ef62b313176dcdba774a56a58c36b54227d1440bc26cbe0aefd82,yes,yes
+openai,"../../synthid/originals/ChatGPT Image May 31, 2026, 02_03_55 PM.png",multilingual_typography,OpenAI SynthID,openai-verify,05b836ecfe40fd689177fda74384ae4fdcc446505bbc4281cd3cbb6523eb669e,yes,yes
+google,../../synthid/originals/Gemini_Generated_Image_633uuy633uuy633u.png,cjk_typography_scene,Google SynthID,gemini-app,4affd7f27767a445db6abf741355743ba8d95108ad922c9fff045feed8492236,yes,yes
+google,../../synthid/originals/Gemini_Generated_Image_akdbeiakdbeiakdb.png,cyrillic_typography_scene,Google SynthID,gemini-app,8c1a6fb03ef3d45a1f958fb3401e4264e409ff88c2a793061db7f29023454d0e,no,no
+google,../../synthid/originals/Gemini_Generated_Image_y48j3cy48j3cy48j.png,crowd_faces,Google SynthID,gemini-app,45d79a683134fcba1b147b2aedb669783d474e1fb8a4df329729a0904fd1b46b,no,no
+google,../../synthid/originals/Gemini_Generated_Image_3mc4t93mc4t93mc4.png,faces_and_typography,Google SynthID,gemini-app,2c33e75a2db614ce74c83cc0a6ac6c3ac735aca83ab88c9c9345843b124f7856,no,no
+meta,../../contentseal/originals/gen_fox_forest.webp,photoreal_texture,Meta Content Seal,meta-oracle,6d7cecf322a5ac4b2547e2f32c767b3cb3e8a0e49f274cfd00aa31be6697eed4,no,no
+meta,../../contentseal/originals/gen_text_poster.webp,typography,Meta Content Seal,meta-oracle,873927662d8198e9c38b4ae71a2919ba5d417dfcd714649db1b0ae231e8cbf9b,no,no
+meta,../../contentseal/originals/gen_lighthouse_watercolor.webp,watercolor,Meta Content Seal,meta-oracle,69bee7c376608568361085602c5c7406900885849bd94c5279c3924cf793b27c,no,no
+meta,../../contentseal/originals/gen_night_city.webp,urban_night,Meta Content Seal,meta-oracle,345adf6b9f777b15ef7ce7bbdfb3b355a1d9e882740809e966e9f6caafd94d48,no,no
+meta,../../contentseal/originals/gen_studio_mug.webp,product_still_life,Meta Content Seal,meta-oracle,2b7bc7fd56fa2250c66ef74f8b3e49d9666fe147d894d5baf9461b5e36077a07,no,no

data/evaluations/engine-selection/content-manifest.csv

@@ -0,0 +1,39 @@
+pair_id,provider,model,file,width,height,content_stratum,sha256,source_payload_sha256,prompt
+00,openai,gpt-image-1-mini,originals/openai/00.png,1024,1024,natural_landscape,698896455e0f1de57a227339227bf068143e690873b9c8c9672b31578de93ba0,1345f59fc7b51a1edf837745245bb90811feefd9ba7f9ba6f12dc89846aeba18,"a stunning photograph of a mountain lake at sunrise, highly detailed, professional photography"
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+01,openai,gpt-image-1-mini,originals/openai/01.png,1024,1024,street_scene,b885d8cb1490e4fbbe580b87750008780671390097d28e71ff18b50cf320ec85,772518e4686940d2c68df114298fb007a97a5c42548245092e989b6ca9bd5b90,"a vibrant street market in Bangkok with colorful fruits and spices, candid photo"
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+03,openai,gpt-image-1-mini,originals/openai/03.png,1024,1024,animal_action,eb6920aab03bbe6935a01756c8f2d524d383e307369cdfaad3fe44926fbd9e48,2012abb15be639ebb3c596d2210f6d4c50cce0e11dd6cfc88aeb29de1c82de18,"a golden retriever running through a field of sunflowers, action photography"
+03,meta,muse-image-1.0,originals/meta/03.png,1600,1600,animal_action,93dce3a5049f773adb882ef22243a84e4822b9c43ad30774741c40f3844ef405,93dce3a5049f773adb882ef22243a84e4822b9c43ad30774741c40f3844ef405,"a golden retriever running through a field of sunflowers, action photography"
+04,openai,gpt-image-1-mini,originals/openai/04.png,1024,1024,reflective_architecture,275d68de881041de989261ced7570dd460028e0406346642d880d0d1664bb9ae,1808d95c69080aafced4234e4c3ad7714121bad00f3f5dc84a744288d9757245,"a modern architecture building with glass facade reflecting sunset clouds"
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+05,openai,gpt-image-1-mini,originals/openai/05.png,1024,1024,food_closeup,316a743ccf29f025904d1bcd047a6996f987715e4f93e8a0d9cf85b624349b07,a8bac088c350ef849bbf78a85a1e44aa1665d1054a0cdfae29461c1cdca56e4a,"a bowl of ramen with steam rising, moody food photography, shallow depth of field"
+05,meta,muse-image-1.0,originals/meta/05.png,1600,1600,food_closeup,4a50ca3e33ddacd2897b926cdc54615a389416fcd2edf4d8803ad882b85b33af,4a50ca3e33ddacd2897b926cdc54615a389416fcd2edf4d8803ad882b85b33af,"a bowl of ramen with steam rising, moody food photography, shallow depth of field"
+06,openai,gpt-image-1-mini,originals/openai/06.png,1024,1024,sports_action,390d87d1f59eb4fa38590c0c751b2848383c77ffcf549571a0bf00db0f783763,6cc24eeb0fce95a86741b9ac0c055002793a586ba37f0cf4d64201a5c5e73513,"a surfer riding a barrel wave at golden hour, backlit spray"
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