feat(v0.3.0): Event Orchestrator skill

- New system-event-orchestrator skill with hook registry, cron registry, and tier classifier

- Three dispatch tiers: :reflex (no LLM), :cognition (light), :reasoning (full)

- Org-mode timestamp parsing for repeat patterns (+1w, +1d, +1m)

- Registers on heartbeat via defskill, dispatches due cron jobs

- Fix all remaining harness-log → log-message references across org files

lisp/security-policy.lisp

@@ -6,7 +6,7 @@
     (if (and explanation (stringp explanation) (> (length explanation) 10))
         action
         (progn
-          (harness-log "POLICY VIOLATION: Action lacks sufficient explanation.")
+          (log-message "POLICY VIOLATION: Action lacks sufficient explanation.")
           (list :type :LOG
                 :payload (list :level :warn
                               :text "Action blocked: Missing or insufficient :explanation. Please justify your reasoning."))))))