status(ghost): init phase — PR inventory done, post-proxy !testme triggered on PR#4

PR#4 (d88f5801) is the correct upgrade PR. All prior failures were pre-proxy-fix (2026-06-12).
Fresh !testme triggered at 06:12:48Z on 2026-06-13 — post proxy /16 fix (05:38Z).
PR#5 is a cfold probe artifact (close after M2); PR#3 superseded (close).

machine-docs/BACKLOG-ghost.md

@@ -0,0 +1,16 @@
+# BACKLOG — phase ghost
+
+## Build backlog
+
+- [x] Inventory PR/branch/comment/build state — done (see STATUS-ghost.md)
+- [ ] Trigger fresh post-proxy !testme on PR#4 (d88f5801) — IN PROGRESS
+- [ ] Watch run, collect logs
+- [ ] If GREEN: document infra-confounded prior failures; ensure cleanup; update PR; claim M1
+- [ ] If RED (recipe reason): make minimal fix (update_config.monitor/start_period); validate; claim M1
+- [ ] Close/mark superseded PRs: close PR#3 (superseded by #4); close PR#5 (cfold probe artifact) after M2
+- [ ] Claim M1 once build result is in and classification is documented
+- [ ] Claim M2 once outcome is operator-ready and PR cleanup is done
+
+## Adversary findings
+
+(empty — Adversary fills this section)