docs: point the superseded drafts at the design document

Twenty-three documents that MESHBAY_DESIGN.md absorbs gain a header saying so
and naming the sections their content went to. None is deleted: code comments,
tests and the documents themselves cite their sections and their labels, and
each records reasoning a synthesis compresses.

The header states the precedence, because two documents describing one system
will disagree eventually: where a draft disagrees with MESHBAY_DESIGN.md the
design document is right, and where either disagrees with the code the code is.

Seven status lines were corrected on the way through, all of them claiming less
than the truth. Videos, Music, Photos, partial-read hashing and account recovery
were headed "proposal, not implemented" months after they shipped; the desktop
client said "nothing here is implemented" with stages A through D running; draft
v6 still called itself the current specification.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YVoHVCcfBqud6ZjG4db3y7

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