feat(events): a trigger can start a run

Rust PLAN_REDESIGNS §14.3.12 (D370), stage 9 of §14.3. A definition's
published version may carry `starts`: a trigger, a condition and a
cooldown. A matching firing creates a run of it, now.

- spec: `starts` validated by the phase gate's own function (same
  grammar, same dormant rule; a dormant start refuses publish), a
  cooldown from 0m to 7d (30m default), at most ten, event.* refused.
- events/starts.js: the emit path's third subscriber, beside dispatch
  and the gate observer. An unverified version starts nothing; one run
  at a time per definition and the cooldown are one conditional UPDATE
  on the new event_trigger_starts table; the occurrence key makes one
  firing reported twice one run. Ignored firings are counted by why.
- event_runs.origin: the firing (trigger, label, time, subject, matched
  condition, declared variables), also on the run.created audit line.
- Editor: a "Started by the game" panel using the gate's condition
  builder, with the ignored-firings line. Run console: "Started because
  ... fired".
- No module contract change and no MODULE_API bump.

Tests: eventStarts (server 21, client 8); eventRunnerSql +7 against a
real MariaDB (75/75); Module-uo proof on uo.champ.boss_up against the
dev database.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/test/eventsAdmin.test.js

@@ -52,6 +52,9 @@ const resourcesDb = require('../src/model/events/eventRunResources.db')
 const participantsDb = require('../src/model/events/eventRunParticipants.db')
 const seriesDb = require('../src/model/events/eventSeries.db')
 const gatesDb = require('../src/model/events/eventPhaseGates.db')
+// Rust PLAN_REDESIGNS §14.3.12: the editor's shape reads the trigger-start state.
+// The same rule as every leg above, a fifth time.
+const triggerStartsDb = require('../src/model/events/eventTriggerStarts.db')
 const activity = require('../src/model/activity/activity.model')
 const db = require('../src/utils/db')
 
@@ -69,6 +72,7 @@ for (const [name, mod] of [
   ['logDb', logDb],
   ['seriesDb', seriesDb],
   ['gatesDb', gatesDb],
+  ['triggerStartsDb', triggerStartsDb],
   ['settingsDb', settingsDb],
   ['budgetDb', budgetDb],
   ['resourcesDb', resourcesDb],
@@ -96,6 +100,7 @@ function installStubs() {
     log: [],
     series: new Map(),
     gates: [],
+    triggerStarts: new Map(),
     settings: new Map(),
     budget: new Map(),
     resources: [],
@@ -295,6 +300,7 @@ function installStubs() {
   // it merely made the file slow. Worth the comment: when the runner or a model
   // gains a leg, every file that stubs the layer under it needs the stub.
   gatesDb.listForRun = async (runId) => store.gates.filter((g) => g.run_id === runId)
+  triggerStartsDb.forDefinition = async (id) => store.triggerStarts.get(id) || null
 
   logDb.listForRun = async (runId) => store.log.filter((l) => l.run_id === runId).reverse()
   logDb.write = async ({ runId, stepId = null, kind, phase = null, detail = null }) => {