the header's rescan walks ITEM_TYPES, and affordances are not one — no
directory per item, no canonical file — so they were invisible to it. write a
new affordance, press the button, and nothing in the response mentions it.
counted by LOADING them rather than counting .md files, so the number means
"affordances the agent will actually receive" and not "markdown files
present": one with no body is skipped by the loader and should not be reported
as though it were working.
counting is as far as this can honestly go, and the toast now says so.
affordanceBlock() is read when a chat session is CREATED, so a new affordance
is already live without a server restart — for the NEXT session. nothing can
retrofit one into a conversation already running, because its system prompt
was assembled when it started. the button's value here is "the file is on disk
and the platform can see it", which was the part genuinely unknowable from the
UI.
also creates the affordances directory, so it is discoverable on a machine
that has never had one, the same way the item dirs already are.