docs(skills): recipes start with hyperframes timeline to see tracks and clips

Author: miguel-heygen

skills-manifest.json

@@ -34,7 +34,7 @@
       "files": 11
     },
     "hyperframes-core": {
-      "hash": "6a1e879292035eed",
+      "hash": "e03aa330b66fca65",
       "files": 11
     },
     "hyperframes-creative": {

skills/hyperframes-core/references/creator-editing-recipes.md

@@ -2,6 +2,8 @@
 
 Use these copyable contracts after `tracks-and-clips.md`. Global math: **consumed source = timeline duration × rate**; **natural timeline duration = remaining source / rate**.
 
+Before any edit, run `npx hyperframes timeline` (add `--json` for a machine-readable list) to see the project's tracks and clips instead of reading the HTML.
+
 These recipes keep sound on a separate `<audio>` element with the `<video>` muted, which is the pattern to reach for when picture and sound are cut independently. An unmuted `<video>` that declares `data-has-audio="true"` is also mixed, so a separate track is a choice, not a requirement.
 
 **Every `<video>` and `<audio>` below carries an `id`, and that is not cosmetic**: `lint` errors with `media_missing_id` on timed media without one, and an id-less `<audio>` is never picked up by the mixer, so the render comes out silent. Keep the ids when you copy a recipe.