feat(events): the public calendar, event pages and participation history (Phase 14a)

The anonymous surface an event was always for: GET /public/events,
/public/events/:slug and /public/events/series/:slug, plus
GET /player/events/history, and the four screens over them.

Four org-lead decisions taken up front: split Phase 14 into 14a (website)
and 14b (the app); add a `listed` flag rather than letting `state` mean both
schedulable and announced; put the `events` capability string in the version
block rather than publishing core as a pseudo-module; and drop "venue" from
the spec rather than adding a field nothing had ever built.

`listed` is announcement, not permission. Publishing is what makes a
definition runnable, so without a separate flag a surprise event would have
to be advertised in order to be allowed to happen. It is a column, a switch
in Phase 13's editor, and three SQL predicates -- never a filter applied
after a read, which works exactly as well until the first caller that forgets.

The public shapes are a projection, and the projection is the security
boundary: nothing is spread, so a column added to event_runs next year does
not ride out through it. The spec, health, cleanup, claims, errors and
member_key are all absent by construction.

The six public event triggers gained `eventUrl` (version 1 -> 2), carrying
?run= because the page lives at the definition's slug while every trigger is
about one occurrence. notify.event-started gained the button, at seedVersion 2.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016wDDVXWMDz82WqE1i969r4

server/src/config/coreTriggers.js

@@ -185,15 +185,22 @@ const TRIGGERS = [
   // runs of the same definition the ids differ, so a weekly event is not
   // throttled by last week's.
   //
-  // **None of the six public ones declares a `url` variable, deliberately.**
-  // There is no public event page until Phase 14 — `App.jsx` mounts nothing
-  // under `/site/events` — and `news.post` has already paid for this mistake
-  // once: its `postUrl` example named `/news/<slug>`, a path that does not
-  // exist, and the template editor previewed a link that was dead in every mail
-  // it sent. A variable added in Phase 14 alongside the page it points at is a
-  // version bump; a variable shipped now is a 404 in an operator's first
-  // announcement. `run.failed` is the exception because its destination exists
-  // today: `/admin/events/runs/:runId` is a real route and an admin can read it.
+  // **All six public ones now declare `eventUrl`, and Phase 14a is what made
+  // that legal.** Until it there was no public event page at all — `App.jsx`
+  // mounted nothing under `/site/events` — and `news.post` had already paid for
+  // that mistake once: its `postUrl` example named `/news/<slug>`, a path that
+  // did not exist, so the template editor previewed a link that was dead in
+  // every mail it sent. The variable arrived with the page it points at, which
+  // is what makes this a version bump (1 -> 2) rather than a correction.
+  //
+  // **It carries `?run=`, and the query string is the whole reason it is a run
+  // url and not an event url.** The page lives at the DEFINITION's slug, so a
+  // weekly event has one stable address — but every one of these triggers is
+  // about one OCCURRENCE, and a mail about last Friday's invasion whose link
+  // opened next Friday's would answer a different question from the one the
+  // reader clicked. `run.failed` keeps its own `runUrl` into the admin console
+  // and gains nothing here: an admin reading about broken machinery wants the
+  // console, not the storyline.
   {
     id: 'event.run.scheduled',
     label: 'Event — scheduled',
@@ -202,7 +209,7 @@ const TRIGGERS = [
     subjectKey: 'runId',
     audience: 'subscribers',
     ceiling: 'authenticated',
-    version: 1,
+    version: 2,
     variables: [
       { name: 'runId', type: 'string', required: true, example: '3692',
         description: 'The run this is about. Also the cooldown subject.' },
@@ -225,6 +232,12 @@ const TRIGGERS = [
       { name: 'startsAtLabel', type: 'string', required: false,
         example: 'Saturday 12 September at 8:00 pm (America/New_York)',
         description: 'The start time written out in the shard-local zone, for a mail to read.' },
+      // The public page for THIS occurrence (Phase 14a). Relative, like
+      // `postUrl` and `runUrl`: the seam resolves it against the site's own
+      // base, and an absolute one baked in here would be wrong on every
+      // deployment but the first.
+      { name: 'eventUrl', type: 'url', required: false, example: '/site/events/the-yew-invasion?run=3692',
+        description: 'The public page for this occurrence.' },
     ],
   },
   {
@@ -235,7 +248,7 @@ const TRIGGERS = [
     subjectKey: 'runId',
     audience: 'subscribers',
     ceiling: 'authenticated',
-    version: 1,
+    version: 2,
     variables: [
       { name: 'runId', type: 'string', required: true, example: '3692',
         description: 'The run this is about. Also the cooldown subject.' },
@@ -258,6 +271,12 @@ const TRIGGERS = [
       { name: 'startsAtLabel', type: 'string', required: false,
         example: 'Saturday 12 September at 8:00 pm (America/New_York)',
         description: 'The start time written out in the shard-local zone, for a mail to read.' },
+      // The public page for THIS occurrence (Phase 14a). Relative, like
+      // `postUrl` and `runUrl`: the seam resolves it against the site's own
+      // base, and an absolute one baked in here would be wrong on every
+      // deployment but the first.
+      { name: 'eventUrl', type: 'url', required: false, example: '/site/events/the-yew-invasion?run=3692',
+        description: 'The public page for this occurrence.' },
     ],
   },
   {
@@ -268,7 +287,7 @@ const TRIGGERS = [
     subjectKey: 'runId',
     audience: 'subscribers',
     ceiling: 'authenticated',
-    version: 1,
+    version: 2,
     variables: [
       { name: 'runId', type: 'string', required: true, example: '3692',
         description: 'The run this is about. Also the cooldown subject.' },
@@ -282,6 +301,12 @@ const TRIGGERS = [
         description: 'Which phase this is, counting from 1.' },
       { name: 'phaseCount', type: 'int', required: true, example: 4,
         description: 'How many phases the pinned version has in total.' },
+      // The public page for THIS occurrence (Phase 14a). Relative, like
+      // `postUrl` and `runUrl`: the seam resolves it against the site's own
+      // base, and an absolute one baked in here would be wrong on every
+      // deployment but the first.
+      { name: 'eventUrl', type: 'url', required: false, example: '/site/events/the-yew-invasion?run=3692',
+        description: 'The public page for this occurrence.' },
     ],
   },
   {
@@ -292,12 +317,18 @@ const TRIGGERS = [
     subjectKey: 'runId',
     audience: 'subscribers',
     ceiling: 'authenticated',
-    version: 1,
+    version: 2,
     variables: [
       { name: 'runId', type: 'string', required: true, example: '3692',
         description: 'The run this is about. Also the cooldown subject.' },
       { name: 'title', type: 'string', required: true, example: 'The Yew Invasion',
         description: 'The event title.' },
+      // The public page for THIS occurrence (Phase 14a). Relative, like
+      // `postUrl` and `runUrl`: the seam resolves it against the site's own
+      // base, and an absolute one baked in here would be wrong on every
+      // deployment but the first.
+      { name: 'eventUrl', type: 'url', required: false, example: '/site/events/the-yew-invasion?run=3692',
+        description: 'The public page for this occurrence.' },
     ],
   },
   {
@@ -308,7 +339,7 @@ const TRIGGERS = [
     subjectKey: 'runId',
     audience: 'subscribers',
     ceiling: 'authenticated',
-    version: 1,
+    version: 2,
     variables: [
       { name: 'runId', type: 'string', required: true, example: '3692',
         description: 'The run this is about. Also the cooldown subject.' },
@@ -324,6 +355,12 @@ const TRIGGERS = [
         description: 'How many participants the run recorded. Zero when nothing collected any.' },
       { name: 'durationMinutes', type: 'int', required: true, example: 95,
         description: 'How long the run took, start to end, in whole minutes.' },
+      // The public page for THIS occurrence (Phase 14a). Relative, like
+      // `postUrl` and `runUrl`: the seam resolves it against the site's own
+      // base, and an absolute one baked in here would be wrong on every
+      // deployment but the first.
+      { name: 'eventUrl', type: 'url', required: false, example: '/site/events/the-yew-invasion?run=3692',
+        description: 'The public page for this occurrence.' },
     ],
   },
   {
@@ -334,7 +371,7 @@ const TRIGGERS = [
     subjectKey: 'runId',
     audience: 'subscribers',
     ceiling: 'authenticated',
-    version: 1,
+    version: 2,
     variables: [
       { name: 'runId', type: 'string', required: true, example: '3692',
         description: 'The run this is about. Also the cooldown subject.' },
@@ -345,6 +382,12 @@ const TRIGGERS = [
       // string is for the run console and would read as gibberish in a mail.
       { name: 'reason', type: 'string', required: false, example: 'The shard is down for an emergency patch.',
         description: 'What the staff member gave as the reason, when they gave one.' },
+      // The public page for THIS occurrence (Phase 14a). Relative, like
+      // `postUrl` and `runUrl`: the seam resolves it against the site's own
+      // base, and an absolute one baked in here would be wrong on every
+      // deployment but the first.
+      { name: 'eventUrl', type: 'url', required: false, example: '/site/events/the-yew-invasion?run=3692',
+        description: 'The public page for this occurrence.' },
     ],
   },
   {
@@ -369,8 +412,9 @@ const TRIGGERS = [
         description: 'The phase it failed in, when it had entered one.' },
       { name: 'error', type: 'string', required: false, example: 'sidecar responded 503',
         description: 'The run’s last error, verbatim from the run row.' },
-      // The one url variable in this file's Phase 10 block, and the reason is
-      // that this route exists TODAY. See the note above the six.
+      // The admin console, not the public page — and this trigger gains no
+      // `eventUrl` at all. An admin reading that the machinery broke wants the
+      // steps and the errors, not the storyline. See the note above the six.
       { name: 'runUrl', type: 'url', required: true, example: '/admin/events/runs/3692',
         description: 'Site-relative path to the run console.' },
     ],