docs(learn): sync generated Playground pages

[hhimanshu]

Automated sync of the Learn > Playground feature pages, generated from source and published as plain MDX content. Review the rendered pages before merging — automated prose cleanup can leave rough edges.

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[hhimanshu]

Superseded by #128, which is now merged.

All ten docs-publish/* PRs opened on 2026-08-14 carry the byte-identical diff — same three files, same +33/-4, +2/-1, +86/-0, and the same sha256 across every one I sampled (#119, #123, #127, #128). They are ten re-runs of one sync, not ten changes, so merging the newest lost nothing.

Closing rather than merging: stacking identical diffs would conflict with each other for no gain.

Worth a look separately — whatever re-opened this ten times in a single day is the actual bug.