refs team#41948

As per the TPA roadmap meeting of Jan 13 2025, we'll "adopt
TPA-RFC-73 as a general guide / rough plan and review as we go".

See: https://gitlab.torproject.org/tpo/tpa/team/-/wikis/meeting/2025-01-13

refs team#41721

This partially reverts "TPA-RFC-34: end of office hours", commit
9c4d600a.

Closes: team#41882

This will be circulated internally as a notification.

This is to distinguish better with the previous emergency email work,
and reuses the "phase N" convention used on TPA-RFC-33 milestones.

I don't understand wtf is going on here, but it looks like edits done
through the wiki interface somehow rewrite the entire file with DOS
line endings.

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