Records what building phase 4 settled, and what it disproved.
The structural correction first: TEAMS.md 3.1 gave the forum a CORE page and phase
3 deleted every core Team page. The ROUTES were unaffected — they are all /player
and /admin — but the participant surface had no home, and 5.4's route table did not
notice. Settled the way phase 3 settled the activity feed: module-uo declares a
second place on its guild page and core fills it, so the phase spans two repos
rather than the one the plan named.
Two slots rather than one, because a slot holds one component and the first fill
wins; the panel navigates by search param because a thread must be linkable and
core cannot mount a route on a page it does not own.
Two findings from the sanitiser worth not re-deriving: `rel` has to be on the
allowlist for the transform that WRITES it to survive, or every forum link ships
without noopener; and the bare-URL linkifier runs after sanitising, over escaped
text only, which is the property that makes it safe rather than an injection point.
Also recorded: the upload sweep runs regardless of the current image mode, which is
the mechanism behind the dialog's promise that disabling uploads does not delete
what is already there; the two routes the table lacked; and the org lead's decision
that all three proposed acknowledgement additions ship.
BACKEND_DESIGN gains the four forum tables and the reasoning a reader of the schema
alone would miss — why the guard is at the route and never at the data, why no
stored body ever contains an <img>, what `uploads` mode hardens, and what the
acknowledgement actually records. MODULE_API's inverted-slot section gains the rule
a module needs: one slot per PLACE, not one per page.
Co-Authored-By: Claude <noreply@anthropic.com>
wtclaude
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