docs(groups): the upload-policy migration is not optional after all

§7c said the Phase 2 fallbacks made the migration script unnecessary. That is
true of every setting but one, and the one it is not true of fails in the
unsafe direction.

`member_upload` is no longer consulted anywhere. A group whose operator had
turned uploads off keeps a node.toml root saying `upload = true`, which reads as
writable — so on the first restart after the upgrade that group accepts uploads
from every member again, silently. It cannot be a fallback: "uploads are off for
this group" and "this root is writable" are two sentences that happened to
disagree, and only the operator knows which they meant.

QE/migration/check_upload_policy.py (unversioned, per the QE/ rule) reads
roster.db and node.toml, reports which groups are affected, and prints the
`root set --no-writable` line for each. It writes nothing and exits non-zero
when something needs a decision, so a deploy script can gate on it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011pvMdvLBG92jyhvD5pD6us

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