diff --git a/docs/BACKLOG.md b/docs/BACKLOG.md
index be1ed27dc..7adf40487 100644
--- a/docs/BACKLOG.md
+++ b/docs/BACKLOG.md
@@ -315,6 +315,7 @@ are closed (status: closed in frontmatter)._
 - [ ] **[B-0513](backlog/P1/B-0513-b0448-slice7-memory-file-empirical-bootstrap-learning-2026-05-14.md)** B-0448 slice 7 — Memory file capturing empirical Cloud Routine bootstrap learning
 - [ ] **[B-0518](backlog/P1/B-0518-sharpen-holding-without-named-dependency-rule-anti-failure-mode-2026-05-14.md)** Sharpen the holding-without-named-dependency rule — Aaron diagnosed CLAUDE.md bug
 - [ ] **[B-0520](backlog/P1/B-0520-new-surface-audit-alignment-check.md)** Mechanize new-surface audit for alignment-clause consistency
+- [ ] **[B-0522](backlog/P1/B-0522-pre-substrate-kenji-era-git-branches-inventory.md)** Pre-substrate Kenji-era git branches and worktrees inventory
 
 ## P2 — research-grade
 
diff --git a/docs/backlog/P1/B-0139-pre-substrate-kenji-era-otto-work-inventory-aaron-2026-05-01.md b/docs/backlog/P1/B-0139-pre-substrate-kenji-era-otto-work-inventory-aaron-2026-05-01.md
index b6bdbbbe1..c22b975c1 100644
--- a/docs/backlog/P1/B-0139-pre-substrate-kenji-era-otto-work-inventory-aaron-2026-05-01.md
+++ b/docs/backlog/P1/B-0139-pre-substrate-kenji-era-otto-work-inventory-aaron-2026-05-01.md
@@ -4,10 +4,11 @@ priority: P1
 status: in-progress
 title: Pre-substrate Kenji-era Otto-lineage work inventory — past recovery branches, worktrees, built artifacts not yet referenced in substrate
 created: 2026-05-01
-last_updated: 2026-05-08
+last_updated: 2026-05-14
 depends_on: []
 type: friction-reducer
-decomposition: blob
+decomposition: partial
+children: [B-0522]
 ---
 
 # B-0139 — Pre-substrate Kenji-era inventory
diff --git a/docs/backlog/P1/B-0522-pre-substrate-kenji-era-git-branches-inventory.md b/docs/backlog/P1/B-0522-pre-substrate-kenji-era-git-branches-inventory.md
new file mode 100644
index 000000000..83c192633
--- /dev/null
+++ b/docs/backlog/P1/B-0522-pre-substrate-kenji-era-git-branches-inventory.md
@@ -0,0 +1,29 @@
+---
+id: B-0522
+priority: P1
+status: open
+title: Pre-substrate Kenji-era git branches and worktrees inventory
+created: 2026-05-14
+last_updated: 2026-05-14
+depends_on: []
+parent: B-0139
+type: friction-reducer
+decomposition: atomic
+---
+
+# B-0522 — Pre-substrate Kenji-era git branches and worktrees inventory
+
+**Decomposed from:** B-0139
+
+## What
+
+Inventory pre-substrate / Kenji-era Otto-lineage work that is in the codebase git branches and worktrees.
+This is a specific slice extracted from the larger B-0139 blob.
+
+1. **Past-recovery git branches** that haven't been triaged or merged. Many of these are from earlier-session work where the autonomous-loop was running under Kenji-the-architect with no formal substrate to record decisions. Likely classes: in-flight feature work, abandoned experiments, drift-fixes that landed differently, recovery-from-incidents with content not yet preserved.
+2. **Worktrees** still on disk that aren't referenced from substrate. Earlier ticks during the recovery-lane work referenced worktree pruning (per task #321); this row's broader scope includes the *content* of those worktrees, not just their classification as LOST/SAFE.
+
+## Acceptance Criteria
+
+1. Branch inventory of past-recovery state, with classification per item: integrated-into-main / abandoned / re-do-needed / preserve-in-substrate / discard-with-rationale.
+2. Worktree content inventory.