feat(events): schema, CRUD and the core action registry (Phase 1)

EVENTS_PLAN.md Phase 1. Six of the nine core tables — the ones that do not
depend on the module contract — plus definitions CRUD, publish, archive, and
the action registry with core as its first registrant.

**Nothing dispatches.** There is no runner until Phase 2, so a run row is
created and stays `scheduled`. That is this phase's correct answer and the
surface renders it verbatim rather than hiding it.

Schema (`db/schema.sql`, append-only):
  event_series, event_definitions, event_versions, event_runs,
  event_run_steps, event_run_log. The four that need a writer —
  event_action_settings, event_run_budget, event_run_resources,
  event_run_participants — arrive with the phases that give them one.

Registry (`modules/registries.js` + `config/coreEventActions.js`):
  registerEventActions staging and commit, with its own id namespace, the
  closed risk and reversibility sets, revert() required iff and only iff
  reversible: 'ledger', a bounded budgetMs and a param shape whose every
  entry needs a type and an example. perform/revert/cost are stripped from
  everything the catalog serves. Core declares core.announce, core.wait and
  core.cue through the same staging area a module will use.

  It is reachable ONLY by registerCore(): loader.js builds its own api facade
  and has no method that delegates here, so no module can call it and
  MODULE_API_VERSION is untouched. Phase 7 adds the facade and the bump.

Surface (13 routes under /api/v1/admin/events):
  Reads staff-wide; publish, archive and run creation admin-only from this
  phase per EVENTS.md §N2, even though the switchboard they will consult does
  not exist yet — a button that is admin-only later and open now is a gate
  nobody notices was missing. The live run controls and `verify` are absent
  rather than stubbed, because nothing is in flight yet.

Four things the build settled, all recorded in docs:
  - event_definitions gained a `spec` column. A draft's working copy cannot
    be an event_versions row: that table is immutable and a run pins one.
  - The spec validator must accept its own output. It added `actionVersion`
    and `dormant` and then refused them as unknown keys, which would have made
    the second save of any definition — and publish's re-validation —
    impossible. A test caught it; both are now accepted and recomputed.
  - A param's `example` is required, optional params included, matching
    registerEventTriggers. It is the authoring form's placeholder.
  - Two routes the §API-surface table did not name: GET /admin/events/:id and
    GET /admin/events/series.

Core's three perform() bodies answer { ok: false, retry: false } rather than
{ ok: true }: `ok: true` on an action that did nothing is a recorded world
change that did not occur, which is the exact mistake §F's failure default
exists to prevent.

`conditions.checkLiteral` is exported and reused for step-param type checking
— one switch over the six types, so "is this a datetime" has one answer.

Verified: 44 new tests, whole server suite, `npm run check:modules`, routes
manifest and swagger regenerated (the manifest diff is +13 routes, zero moved).

Docs: RunicGateway/docs#209

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

server/src/router/v1/admin/index.js

@@ -31,6 +31,7 @@ const discordBotRouter = require('./discordBot.router')
 const settingsRouter = require('./settings.router')
 const modulesRouter = require('./modules.router')
 const engagementRouter = require('./engagement.router')
+const eventsRouter = require('./events.router')
 const teamsRouter = require('./teams.router')
 const teamsVoiceRouter = require('./teamsVoice.router')
 const dashboardRouter = require('./dashboard.router')
@@ -87,6 +88,13 @@ adminRouter.use('/modules', modulesRouter)
 // /modules above and for a related reason: this is the surface that decides who
 // the site sends mail to.
 adminRouter.use('/engagement', engagementRouter)
+// The Event System (EVENTS.md § API surface, Phase 1). Staff-wide for the reads
+// and gated per route for the writes, which is where §N2's asymmetry lives:
+// publish and start are `admin` ONLY, while the live run controls Phase 3 adds
+// are `admin` + `moderator`. Starting commits the deployment to an unattended
+// world change; cancelling is incident response, and they are deliberately not
+// the same gate.
+adminRouter.use('/events', eventsRouter)
 // Teams. Staff-wide, like /activity: a moderator runs the reserved-name review
 // queue. The three actions that PUBLISH untrusted game-sourced strings are gated
 // per request inside the controller, not per route — a moderator may call them,