fix(rust): lowercase the reward option-source ids, and test the grammar

The first boot against real core refused the whole module at register:
`rust.options.runZones` fails core's EVENT_ID grammar, which is lowercase
dotted segments only. The fake api validates none of it, so 310 green
tests said nothing. The four fixed-choice sources and the chat-server
source are renamed, and entry.test now holds every action, budget,
lease and option-source id against a copy of the grammar.

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

server/test/entry.test.js

@@ -203,6 +203,24 @@ test('the event verbs are registered, and every budget has a verb that spends it
   }
 })
 
+test('every event id is one the core grammar accepts (phase 13b)', () => {
+  const { api } = register()
+
+  // Core's EVENT_ID (modules/registries.js), copied rather than imported: this
+  // module cannot reach core's tree. The fake api validates none of it, and
+  // phase 13b's first boot against real core refused the WHOLE module over one
+  // camelCase source id (`rust.options.runZones`). Lowercase dotted segments only.
+  const EVENT_ID = /^[a-z][a-z0-9_]*(\.[a-z][a-z0-9_]*)+$/
+  const ids = [
+    ...api.record.eventActions.map((a) => a.id),
+    ...api.record.eventBudgets.map((b) => b.id),
+    ...api.record.eventOptionSources.map((s) => s.id),
+    ...api.record.eventLeases.map((l) => l.id),
+  ]
+  for (const a of api.record.eventActions) for (const p of a.params) if (p.source) ids.push(p.source)
+  for (const id of ids) assert.match(id, EVENT_ID, id)
+})
+
 test('the leases and their option sources are registered, every source a lease reads (phase 12)', () => {
   const { api } = register()