feat(events): enablement, per-run caps and mayInvoke (Phase 6)

Two new tables — event_action_settings (the deployment switchboard) and
event_run_budget (what a run has spent and the most it may) — plus verified_at
and verified_by on event_versions. The whole authorisation decision moves behind
one function, events/authorize.js: role, enablement, cap, and the shard's own
switch named as the layer core deliberately does not duplicate.

Three routes, none moved: GET/PUT /admin/events/actions (admin in both
directions) and POST /admin/events/:id/verify (admin, editor — a dry run
dispatches nothing).

Four decisions, settled by the org lead 2026-09-03:

- The default-off line falls between inspect and change, not between notify and
  inspect. Read literally, §K shipped core.wait disabled. The same line is the
  role floor.
- The tightest cap wins where two actions spend one dimension, pinned into the
  run at creation with the action it came from.
- A refusal follows the step's on_failure and takes health to degraded — its own
  status and its own log kind, because a refusal is not an outage.
- The verify gate is enforced for scheduled starts only: a human pressing Start
  now is the review the gate exists to require.

Derived and flagged for review: a dry run fails rather than warns on a disabled
action or an over-cap plan, and the unattended path does not re-check the
starter's role.

+111 tests (1921/1847/73/1 — the one failure pre-existing and environmental),
including a 403 walk over the real router and two concurrent spends against one
cap on a real MariaDB. The live walk found two defects, both fixed here: the run
console route dropped the budget it was handed, and the role refusal used a
plural verb over a one-item list.

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T6t8mrAWhZU5vnyYgZTMtL

client/test/eventAuthoring.test.js

@@ -11,6 +11,7 @@ import {
   blankStep,
   blankPhase,
   describeLogLine,
+  logKindWord,
   runStatusWord,
   describeSchedule,
   scheduleFormFrom,
@@ -557,3 +558,47 @@ test('the log renders Phase 5\'s three kinds, including the near miss', () => {
     /loot advanced on its deadline after 600s/,
   )
 })
+
+test("the log renders Phase 6's three kinds, and a refusal does not read as a failure", () => {
+  // The distinction the whole kind exists for. An operator scanning a stopped run
+  // has to be able to see that nothing is broken — the deployment simply does not
+  // permit what the author asked for — and the answer differs by cause: a switch
+  // for "not enabled", a number for "over the cap".
+  assert.match(
+    describeLogLine({
+      kind: 'step.refused',
+      detail: { action: 'uo.creature.spawn', error: 'asks for 12 of "uo.creatures"; 28 of 30 is already spent this run' },
+    }),
+    /uo\.creature\.spawn refused: asks for 12 of "uo\.creatures"; 28 of 30 is already spent this run/,
+  )
+  assert.match(
+    describeLogLine({
+      kind: 'step.refused',
+      detail: { action: 'uo.creature.spawn', error: '"Spawn creatures" is not enabled on this deployment' },
+    }),
+    /refused: "Spawn creatures" is not enabled/,
+  )
+  assert.equal(logKindWord('step.refused'), 'Refused')
+
+  // The caps a run was seeded with, and which switch set each — so a number on
+  // the meter can be traced back to something an operator can change.
+  assert.match(
+    describeLogLine({
+      kind: 'run.budget',
+      detail: { dimensions: [{ dimension: 'uo.creatures', cap: 30, from: 'uo.creature.spawn' }] },
+    }),
+    /uo\.creatures capped at 30 \(uo\.creature\.spawn\)/,
+  )
+  assert.match(
+    describeLogLine({ kind: 'run.budget', detail: { dimensions: [{ dimension: 'uo.gate.minutes', cap: null, from: null }] } }),
+    /uo\.gate\.minutes capped at nothing/,
+  )
+  // A run with no capped dimension at all still gets a sentence rather than an
+  // empty line, because an empty log entry reads as a bug.
+  assert.match(describeLogLine({ kind: 'run.budget', detail: { dimensions: [] } }), /no caps apply to this run/)
+
+  assert.match(
+    describeLogLine({ kind: 'version.verified', detail: { versionId: 4, version: 2, by: 1 } }),
+    /Version 2 passed its dry run — scheduled occurrences may start/,
+  )
+})