feat: add memory injection audit trail for effectiveness tracking

skills/run/SKILL.md

@@ -63,6 +63,25 @@ After emitting `run.start`, record `SEQ_RUN_START=1`.
 
 If `--start-from` is specified, verify that the required prior artifacts exist in `.archeflow/artifacts/${RUN_ID}/` before skipping phases. If missing, abort with an error.
 
+#### 0b. Memory Injection
+
+Load cross-run memory lessons and inject into agent prompts. Use `--audit` to track which lessons were injected for this run:
+
+```bash
+# Load cross-run memory for this domain (with audit trail)
+MEMORY_LESSONS=$(./lib/archeflow-memory.sh inject "$DOMAIN" "" --audit "$RUN_ID")
+
+# Inject into Explorer/Creator prompts if non-empty
+if [[ -n "$MEMORY_LESSONS" ]]; then
+  EXPLORER_PROMPT="${EXPLORER_PROMPT}
+
+${MEMORY_LESSONS}"
+  CREATOR_PROMPT="${CREATOR_PROMPT}
+
+${MEMORY_LESSONS}"
+fi
+```
+
 ---
 
 ### 1. Plan Phase