docs(skills): define TasteForge multimodal contract

skills/tasteforge-video/SKILL.md

@@ -106,6 +106,42 @@ and stop; do not reconstruct its logic inline.
    generation history, fixture provenance, provider references as
    pointer-only records.
 
+## File-Driven Multimodal Contract
+
+Use this path when local references must drive dry-run generation plans for
+image, video, and 3D-asset outputs while preserving genre separation:
+
+```bash
+python3 -m tasteforge multimodal --config workflow.json --out-dir out/multimodal
+```
+
+The config names numbered genres and local evidence files. Keep these candidate
+genres distinct rather than blending them into one generic aesthetic:
+
+1. Flash Ethereal
+2. 3D Cyber Glitch
+3. Fluid Sketch
+
+The command measures local references with ffprobe/ffmpeg and emits one style
+spec per genre, separate image, video, and 3D-asset manifests, provenance, and
+a Resolve effect recipe. The effect schedule must be seeded aperiodic. CV
+effects require a real subject anchor with fail-closed track-loss behavior.
+Every effect carries placement constraints that preserve faces and readable
+type and prevent decorative corner meshes from replacing full-frame 3D work.
+
+The returned receipt is the bundle boundary. It binds every emitted evidence
+artifact by relative path, byte size, SHA-256, genre, modality,
+`provider_execution: false`, and exact reference/time provenance. Manifests and
+requests also require `provider_calls: 0`, `provider_execution: false`,
+`submit: false`, and disabled provider-call mode. Whole-file evidence uses an
+explicit whole-file time basis and never invents timestamps.
+
+Always run bundle validation after creation. A missing image, video, or 3D-asset
+manifest must fail closed. Genericized or duplicate genres, periodic schedules,
+unanchored CV effects, missing placement constraints, provider-execution flags,
+unbound output files, byte-size drift, or SHA-256 tampering must fail closed.
+Do not repair a failed receipt by deleting evidence or weakening validation.
+
 ## Example Session
 
 ```bash

tests/ci/tasteforge-video-skill.test.js

@@ -81,6 +81,27 @@ test("describes the deterministic workflow surface faithfully", () => {
   assert.match(skill, /style pack/i);
 });
 
+test("defines the fail-closed file-driven multimodal contract", () => {
+  const skill = read("skills/tasteforge-video/SKILL.md");
+  assert.match(skill, /python3 -m tasteforge multimodal --config/);
+  for (const phrase of [
+    /Flash Ethereal/,
+    /3D Cyber Glitch/,
+    /Fluid Sketch/,
+    /image.*video.*3D-asset/is,
+    /seeded aperiodic/i,
+    /subject anchor/i,
+    /placement constraints/i,
+    /provider_execution:\s*false/i,
+    /path.*byte size.*SHA-256/is,
+    /genre.*modality/is,
+    /exact reference\/time provenance/i,
+    /provider_calls:\s*0/i,
+  ]) assert.match(skill, phrase);
+  assert.match(skill, /missing.*manifest.*fail closed/is);
+  assert.match(skill, /tamper.*fail closed/is);
+});
+
 test("ships through the opt-in media-generation install module and npm package", () => {
   const modules = readJson("manifests/install-modules.json").modules;
   const module = modules.find((candidate) => candidate.id === "media-generation");