diff --git a/.yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/artifacts/.gitkeep b/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/artifacts/.gitkeep
similarity index 100%
rename from .yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/artifacts/.gitkeep
rename to .yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/artifacts/.gitkeep
diff --git a/.yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/item.md b/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/item.md
similarity index 97%
rename from .yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/item.md
rename to .yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/item.md
index 80de4ca6..53f8b6b9 100644
--- a/.yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/item.md
+++ b/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/item.md
@@ -2,13 +2,13 @@
 id: 20260607-062902-memory-root-uses-yoi-memory-marker
 slug: memory-root-uses-yoi-memory-marker
 title: Use .yoi/memory marker for repo-local memory root
-status: open
+status: closed
 kind: task
 priority: P1
 labels: [memory, workspace, worktree, config]
-workflow_state: ready
+workflow_state: done
 created_at: 2026-06-07T06:29:02Z
-updated_at: 2026-06-07T07:58:15Z
+updated_at: 2026-06-07T07:59:04Z
 assignee: null
 legacy_ticket: null
 ---
diff --git a/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/resolution.md b/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/resolution.md
new file mode 100644
index 00000000..6d724341
--- /dev/null
+++ b/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/resolution.md
@@ -0,0 +1,25 @@
+Implemented, reviewed, merged, and validated.
+
+Summary:
+- Kept `.yoi` as the Yoi project records marker while stopping `.yoi` alone from acting as the memory root marker.
+- `WorkspaceLayout::resolve` still honors explicit `memory.workspace_root` exactly.
+- Without explicit root, memory layout resolution now walks ancestors from the default root and selects the nearest ancestor containing `.yoi/memory`.
+- Child worktrees containing `.yoi/tickets` / `.yoi/workflow` but no `.yoi/memory` do not become independent memory roots when an ancestor `.yoi/memory` exists.
+- `.yoi` project records alone do not define a memory marker root.
+- No-marker fallback remains `default_root` as documented compatibility behavior, without relying on `.yoi` presence.
+- No broad memory enable/disable redesign or user-data overlay fallback was introduced.
+- `MemoryConfig` docs were updated to describe marker-based implicit resolution.
+
+Implementation:
+- Child commit: `9ed6613 memory: resolve repo memory by memory marker`
+- Merge commit: `merge: memory root marker`
+
+Review:
+- External reviewer `memory-root-marker-reviewer-20260607` approved with no blockers.
+
+Validation after merge:
+- `cargo test -p memory workspace --lib`
+- `cargo test -p pod memory --lib`
+- `cargo fmt --check`
+- `git diff --check`
+- `target/debug/yoi ticket doctor`
\ No newline at end of file
diff --git a/.yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/thread.md b/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/thread.md
similarity index 82%
rename from .yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/thread.md
rename to .yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/thread.md
index 0b4cf419..e0f75c43 100644
--- a/.yoi/tickets/open/20260607-062902-memory-root-uses-yoi-memory-marker/thread.md
+++ b/.yoi/tickets/closed/20260607-062902-memory-root-uses-yoi-memory-marker/thread.md
@@ -153,3 +153,44 @@ Reviewer validation:
 Merge readiness: approved; implementation worktree clean and merge-tree against current `develop` succeeded.
 
 ---
+
+<!-- event: state_changed author: hare at: 2026-06-07T07:59:04Z from: ready to: done reason: closed field: workflow_state -->
+
+## State changed
+
+Ticket closed; workflow_state set to done.
+
+
+---
+
+<!-- event: close author: hare at: 2026-06-07T07:59:04Z status: closed -->
+
+## Closed
+
+Implemented, reviewed, merged, and validated.
+
+Summary:
+- Kept `.yoi` as the Yoi project records marker while stopping `.yoi` alone from acting as the memory root marker.
+- `WorkspaceLayout::resolve` still honors explicit `memory.workspace_root` exactly.
+- Without explicit root, memory layout resolution now walks ancestors from the default root and selects the nearest ancestor containing `.yoi/memory`.
+- Child worktrees containing `.yoi/tickets` / `.yoi/workflow` but no `.yoi/memory` do not become independent memory roots when an ancestor `.yoi/memory` exists.
+- `.yoi` project records alone do not define a memory marker root.
+- No-marker fallback remains `default_root` as documented compatibility behavior, without relying on `.yoi` presence.
+- No broad memory enable/disable redesign or user-data overlay fallback was introduced.
+- `MemoryConfig` docs were updated to describe marker-based implicit resolution.
+
+Implementation:
+- Child commit: `9ed6613 memory: resolve repo memory by memory marker`
+- Merge commit: `merge: memory root marker`
+
+Review:
+- External reviewer `memory-root-marker-reviewer-20260607` approved with no blockers.
+
+Validation after merge:
+- `cargo test -p memory workspace --lib`
+- `cargo test -p pod memory --lib`
+- `cargo fmt --check`
+- `git diff --check`
+- `target/debug/yoi ticket doctor`
+
+---