feat(engagement): the admin ceiling and core's news.post emitter (Phase 11a)

Core's half of ENGAGEMENT.md Phase 11a: the two decisions the org lead settled
before any code that land in core rather than in module-uo. Pairs with
Module-uo#22 and docs#194.

## Decision 1 -- a seventh ceiling, `admin`, as a child of `staff`

Phase 11's operator-facing triggers (uo.audit.staff_action, uo.economy.milestone,
uo.world.saved) are described as admin-audience everywhere, and the narrowest
value the lattice had was `staff` -- which ceilings.js defines as admin, editor
AND moderator. Ceilinging them there would have let an operator save a rule that
mails the staff audit digest to every moderator in it.

`admin` is the ONLY genuine refinement in the tree -- every admin is staff, which
is exactly the containment every other pair of branches lacks -- so it is a child
rather than a seventh leaf, and permits/meet/meetAll needed no change beyond the
new PARENT entry.

**The one non-obvious consequence, and the reason for ROLE_CEILINGS.**
notificationChannelPrefs' `visibleTo` asked `item.ceiling !== 'staff'`. That was
correct while `staff` was the only role-gated value, and the day `admin` arrived
it would have silently published every admin-ceilinged id -- the staff audit
digest, the economy thresholds -- to every player's preferences screen by name.
It now reads a TABLE (`ceilings.reachableBy`), so a ceiling added without an entry
fails closed instead. An EDITOR is the viewer that tells the two rules apart, and
the new tests use one.

MODULE_API_VERSION -> 1.8.0 on both halves. Additive: every declaration valid
under 1.7.0 is valid now and no stored value changes.

## Decision 5 -- 7.1 Q9: news.post gets an emitter, and it REPLACES the tickle

`news.post` has been a declared payload contract with no caller since Phase 2, so
a rule naming it could never fire. utils/newsNotify.js is the caller;
announceIfNewlyPublished now calls it instead of pushDispatch.publish, gated on
the same enqueueIfNeeded job id -- the single "newly published news" transition
signal, not re-derived.

**News push therefore stops on upgrade** until an operator enables the seeded
rule. That is the org lead's decision, taken over keeping the raw call beside the
emit "for one release": an exception with a deadline nobody owns, which Phase 6
already refused for Teams. The Rules screen gains a second migration notice
naming news, and Phase 13's release note carries it as an upgrade step.

**The seed needed its own one-shot key, and this is the trap worth recording.**
`engagement_team_rules_seeded` is already stamped on every deployment that has
booted since Phase 6, and the guard reads its presence -- so appending news to
RULES would have seeded it on fresh installs only, and on exactly the upgrades
that lose their raw push, never. One key per seed GROUP is now the rule;
seedGroup() is the shared implementation and seedCoreRules() is what boot calls.

Also fixes news.post's `postUrl` example, which named `/news/<slug>` -- a path
App.jsx does not mount. An example is what the template editor previews and
test-sends with, so a wrong one is a preview that looks right and a mail that is
not. It is `/site/news`, the list, which is what the Discord and town-crier
announcements have always linked.

1550 tests pass (16 new), 327 client tests pass, client builds, check:modules
clean -- core still names no module identifier with module-uo now registering 24
UO-named triggers.

Co-Authored-By: Claude <noreply@anthropic.com>

server/src/modules/version.js

@@ -9,6 +9,26 @@
 // Deliberately separate from PROTOCOL_VERSION (which versions the shard wire and
 // has nothing to say about a website module) and from any module's own version.
 
+// 1.8.0 - a seventh value in the audience ceiling lattice: `admin`, a child of
+// `staff` (docs/website/ENGAGEMENT.md Phase 11, decision 1). A module may now
+// declare `ceiling: 'admin'` on a trigger or an audience, so the set of values
+// `registerEventTriggers` and `registerAudiences` accept grew. Additions only,
+// so minor: every declaration valid before is valid now, no stored value
+// changes, and module-uo's `coreApi: "^1.3.0"` still resolves.
+//
+// It exists because Phase 11's operator-facing triggers - `uo.audit.staff_action`,
+// `uo.economy.milestone`, `uo.world.saved` - are described everywhere as
+// admin-audience, and the narrowest value the lattice had was `staff`, which
+// means admin / editor / moderator. Ceilinging them there would have permitted a
+// rule that mails the staff audit digest to every editor.
+//
+// **What a module has to know about it beyond the new name.** `admin` is the one
+// pair in the tree with real containment - every admin is staff - so it is the
+// only place `permits` is true between two non-`authenticated` values:
+// `permits('staff', 'admin')` holds and nothing else of that shape does. A
+// trigger ceilinged `staff` therefore accepts an `admin` audience, which is the
+// intended narrowing, and the reverse is refused as it should be.
+
 // 1.7.0 — the engagement contract (docs/website/ENGAGEMENT.md Phase 2).
 // Additions only, so minor: `api.registerEventTriggers([...])`,
 // `api.registerAudiences([...])`, `ctx.events.emit(triggerId, envelope)` and
@@ -81,6 +101,6 @@
 // an admin action a module performs belongs in core's one audit log, the
 // extension slot needs the user its prefix names, and §2.7 forbids a module
 // reading core's `APP_BASE_URL` for itself. Additions only, so minor.
-const MODULE_API_VERSION = '1.7.0'
+const MODULE_API_VERSION = '1.8.0'
 
 module.exports = { MODULE_API_VERSION }