Miguel Ángel fc52d21c59 docs: clarify composition variable usage (#420) ...

## Summary
- replace the unsupported `data-var-*` example with the current `data-variable-values` pattern
- document that variable values are carried through but still applied manually inside the nested composition
- add matching reference notes in the data-attributes, HTML schema, core package, and CLI docs

## Verification
- `npx mintlify dev --port 3100`
- browser verification with `agent-browser` on `/concepts/compositions` and `/reference/html-schema`
- proof artifacts saved locally under `tmp/issue-416-docs/`

2026-04-22 20:41:35 +02:00

..

html-schema.mdx

docs: clarify composition variable usage (#420)

2026-04-22 20:41:35 +02:00