docs(work-items): require umbrella-side membership comment in fold sequence

[kyle-sexton]

Closes #633

Documents the atomic fold sequence (item comment, umbrella comment, blocked-by edge, strip raw marker) in issue-conventions.md.

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[kyle-sexton]

Closing as duplicate: umbrella-side membership comment requirement is already on main (fold sequence docs landed via #2488 / related merges). Remaining diff is only a conflicting 0.35.9 changelog bump.

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Re-run the job to retry the review. A new push re-triggers this lane only if the caller's pull_request triggers include synchronize (the canonical caller omits it).
An automatic retry may already have run — it is skipped when a partial review could duplicate comments, or when the failure class needs an operator (auth).