feat: add decision.point event type, decision logger, and run replay script

- archeflow-decision.sh: convenience wrapper for logging PDCA decision points
- archeflow-replay.sh: timeline view and weighted what-if replay for recorded runs
- archeflow-event.sh: add decision.point usage example
- archeflow-dag.sh: render decision.point events in DAG output

lib/archeflow-dag.sh

@@ -87,6 +87,9 @@ EVENTS_PARSED=$(jq -r '
     elif .type == "agent.complete" then
       (.data.archetype // .agent // "unknown") + " (" + .phase + ")" +
       (if (.data.tokens // 0) > 0 then " [" + (.data.tokens | tostring) + " tok]" else "" end)
+    elif .type == "decision.point" then
+      (.data.archetype // .agent // "?") + " → " + (.data.decision // "?") +
+      " (conf " + ((.data.confidence // 0) | tostring) + ")"
     elif .type == "decision" then
       "decision: " + (.data.what // "unknown") + " → " + (.data.chosen // "unknown")
     elif .type == "phase.transition" then
@@ -209,7 +212,7 @@ render_node() {
   local colored_label
   case "$type" in
     phase.transition) colored_label="${C_TRANS}${label}${C_RESET}" ;;
-    decision)         colored_label="${C_DECISION}${label}${C_RESET}" ;;
+    decision|decision.point) colored_label="${C_DECISION}${label}${C_RESET}" ;;
     review.verdict)   colored_label="${C_VERDICT}${label}${C_RESET}" ;;
     *)                colored_label="${pc}${label}${C_RESET}" ;;
   esac