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The media_in_subcomposition rule blanket-errored every <video>/<audio>
inside a sub-composition, claiming nested media is "never seeked/decoded
and renders blank/black". This is false: the runtime discovers media with
a flat document.querySelectorAll("video, audio"), resolves each element's
host composition via closest("[data-composition-id]"), and rebases its
local data-start by the accumulated absolute start of every ancestor
composition (packages/core/src/runtime/{media,startResolver}.ts). Media
seeks and decodes at any nesting depth, verified end to end through the
producer render path.
- Remove the rule and flip its test to assert nested media is NOT flagged.
- Drop the now-dead media_in_subcomposition clause from the registry
components test.
- Drop the equivalent pre-render guard from the faceless-explainer and
pr-to-video assemble scripts.
- Correct the reference docs (hyperframes-core SKILL, data-attributes,
variables-and-media, composition-patterns; hyperframes-cli
lint-validate-inspect): media works at any depth. Preserve the one real
constraint, that a sub-comp timeline cannot reach host-root elements, so
host-root media motion is authored on the main timeline.