The inverted slot direction reached exactly one module. Core filled three
literal names - uo.guild.detail, uo.guild.forum, uo.guild.header - matched by
exact name in applyCoreFills, so a second game declaring a place under its own
id got an empty page and no error. "A fill for a slot nobody declared is not an
error" is the rule that made the miss invisible, and it is the right rule; what
was wrong was core knowing a slot's name at all.
It also put a module identifier inside core, in three string literals
scripts/checkModuleIdentifiers.js masks by construction and could never catch.
Found by the integration kit while writing the chapter that teaches this shape
to an audience outside this org - which is what that phase is for.
So the module says WHERE, in its own vocabulary, and WHICH of core's
contributions goes there:
declareModuleSlot(ID, 'uo.guild.detail', { core: 'team.activity' })
and core offers into the catalogue rather than into a name:
offerCoreFill('team.activity', TeamActivityFeed)
CORE_CONTRIBUTIONS is exported and fixed at build time, so asking for one core
does not offer THROWS at the declaration. That asymmetry with an unfilled slot
is deliberate: an unknown contribution is always a typo or a version skew - the
module's coreApi range has already been checked - and the failure it would
otherwise produce is a page that renders empty forever with nothing logged.
options.core is optional; a slot that asks for nothing stays empty, which is
what a module declaring a place it fills itself wants. More than one slot may
ask for the same contribution and each gets it: how many places a module wants
its feed in is a layout decision on a page core does not own.
Amends MODULE_API 1.6.0 in place rather than adding 1.7.0 - the same rule the
eighth and ninth members were given, and 1.6.0 has only ever been on edge.
Also: the UI kit is nine exports, not eight. Slot made it nine in phase 3 and
the comment beside it still said eighth.
288 client tests, 1162 server tests.
Co-Authored-By: Claude <noreply@anthropic.com>
wtclaude
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