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

org/system-archivist.org

@@ -14,7 +14,7 @@ The *Scribe Skill* manages the agent's internal documentation and logs.
   "Logs a metabolic signal for later analysis."
   (let ((type (getf signal :type))
         (payload (getf signal :payload)))
-    (harness-log "SCRIBE: [~a] ~s" type payload)))
+    (log-message "SCRIBE: [~a] ~s" type payload)))
 #+end_src
 
 ** Skill Registration