docs: drop two changesets that promise more than the branch delivers

A changeset lands in CHANGELOG.md verbatim, so it may only describe what an
operator can actually do.

"practices can count for more in their area" says a practice can be weighted.
areaWeight exists as a column and both halves of the area view read it, but
nothing writes it — no endpoint, no DTO, no screen. Announcing a setting nobody
can set would be the release note lying.

"an area says which kind of silence it is" says the same thing as "a practice
says why it has nothing to say", which already covers both levels and states
that an area's standing is read straight off its practices.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017XBuU2tfPFntHoE34Cmw1Z

Author: 2 people