diff --git a/.yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/artifacts/.gitkeep b/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/artifacts/.gitkeep
similarity index 100%
rename from .yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/artifacts/.gitkeep
rename to .yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/artifacts/.gitkeep
diff --git a/.yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/item.md b/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/item.md
similarity index 98%
rename from .yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/item.md
rename to .yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/item.md
index 1ef5c0c0..14affa43 100644
--- a/.yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/item.md
+++ b/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/item.md
@@ -2,13 +2,13 @@
 id: '20260608-132230-deprecate-umbrella-tickets'
 slug: 'deprecate-umbrella-tickets'
 title: 'Deprecate umbrella Tickets'
-status: 'open'
+status: 'closed'
 kind: 'task'
 priority: 'P2'
 labels: ['ticket', 'workflow', 'documentation', 'planning']
-workflow_state: 'inprogress'
+workflow_state: 'done'
 created_at: '2026-06-08T13:22:30Z'
-updated_at: '2026-06-09T01:37:59Z'
+updated_at: '2026-06-09T02:04:40Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-06-09T01:14:14Z'
diff --git a/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/resolution.md b/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/resolution.md
new file mode 100644
index 00000000..8650a3bd
--- /dev/null
+++ b/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/resolution.md
@@ -0,0 +1,22 @@
+Implemented, reviewed, merged, and validated.
+
+Summary:
+- Deprecated long-lived umbrella/progress-container Tickets in maintained workflow/docs guidance.
+- Clarified that Tickets should be concrete work items that can be implemented, reviewed, validated, and closed on their own terms.
+- Updated broad-request split guidance to use concrete implementable Tickets, durable split decisions, Objective context, and future non-hierarchical typed relations rather than umbrella containers.
+- Explicitly disallowed hierarchy/container substitutes such as parent/child, sub-ticket, umbrella, part-of, and contains.
+- Preserved the carve-out for concrete planning/design/investigation Tickets.
+- Added existing umbrella retirement guidance and recorded a migration/close recommendation on `workspace-panel-orchestrator-queue-automation`.
+
+Implementation:
+- Coder commit: `1349a75 ticket: deprecate umbrella containers`
+- Reviewer approved with no blocking findings.
+- Merge commit: `ee41ed9 merge: deprecate umbrella tickets`
+
+Validation after merge:
+- `cargo fmt --check`
+- `git diff --check`
+- `cargo run -q -p yoi -- ticket doctor`
+- `nix build .#yoi`
+
+`cargo check --workspace` was intentionally omitted because the merged implementation is docs/workflow/Ticket-thread-only and no Rust code/tests changed; Nix build covered package/resource integrity.
\ No newline at end of file
diff --git a/.yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/thread.md b/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/thread.md
similarity index 91%
rename from .yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/thread.md
rename to .yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/thread.md
index a414768d..a04c7e7b 100644
--- a/.yoi/tickets/open/20260608-132230-deprecate-umbrella-tickets/thread.md
+++ b/.yoi/tickets/closed/20260608-132230-deprecate-umbrella-tickets/thread.md
@@ -299,3 +299,41 @@ Residual risks / notes:
 - Final merge/close/cleanup is intentionally not performed here without explicit merge approval.
 
 ---
+
+<!-- event: state_changed author: hare at: 2026-06-09T02:04:39Z from: inprogress to: done reason: closed field: workflow_state -->
+
+## State changed
+
+Ticket closed; workflow_state を done に設定しました。
+
+
+---
+
+<!-- event: close author: hare at: 2026-06-09T02:04:40Z status: closed -->
+
+## 完了
+
+Implemented, reviewed, merged, and validated.
+
+Summary:
+- Deprecated long-lived umbrella/progress-container Tickets in maintained workflow/docs guidance.
+- Clarified that Tickets should be concrete work items that can be implemented, reviewed, validated, and closed on their own terms.
+- Updated broad-request split guidance to use concrete implementable Tickets, durable split decisions, Objective context, and future non-hierarchical typed relations rather than umbrella containers.
+- Explicitly disallowed hierarchy/container substitutes such as parent/child, sub-ticket, umbrella, part-of, and contains.
+- Preserved the carve-out for concrete planning/design/investigation Tickets.
+- Added existing umbrella retirement guidance and recorded a migration/close recommendation on `workspace-panel-orchestrator-queue-automation`.
+
+Implementation:
+- Coder commit: `1349a75 ticket: deprecate umbrella containers`
+- Reviewer approved with no blocking findings.
+- Merge commit: `ee41ed9 merge: deprecate umbrella tickets`
+
+Validation after merge:
+- `cargo fmt --check`
+- `git diff --check`
+- `cargo run -q -p yoi -- ticket doctor`
+- `nix build .#yoi`
+
+`cargo check --workspace` was intentionally omitted because the merged implementation is docs/workflow/Ticket-thread-only and no Rust code/tests changed; Nix build covered package/resource integrity.
+
+---