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

server/src/model/events/eventRunLog.db.js

@@ -40,6 +40,13 @@ const KINDS = [
   'phase.gate',          // a phase opened an advance gate, with what it waits for
   'condition.evaluated', // a firing was tested against a gate, matched or not
   'phase.advanced',      // a gate opened: on a firing, on its deadline, or forced
+  // Phase 6's three. `step.refused` is the one worth naming separately from
+  // `step.status`: a refusal is not a failure, and an operator reading a run that
+  // stopped needs to see at a glance that nothing is broken -- the deployment
+  // simply does not permit what the author asked for.
+  'run.budget',       // the caps this run was seeded with, and which switch set each
+  'step.refused',     // a step was not permitted: disabled, or over a cap
+  'version.verified', // a dry run passed against a version, unlocking scheduled starts
 ]
 
 const hydrate = (row) => row && { ...row, detail: parseJson(row.detail, null) }