diff --git a/.yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/artifacts/.gitkeep b/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/artifacts/.gitkeep
similarity index 100%
rename from .yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/artifacts/.gitkeep
rename to .yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/artifacts/.gitkeep
diff --git a/.yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/item.md b/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/item.md
similarity index 98%
rename from .yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/item.md
rename to .yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/item.md
index 429dc3b9..329bba30 100644
--- a/.yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/item.md
+++ b/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/item.md
@@ -2,13 +2,13 @@
 id: '20260608-103842-remove-legacy-ticket-schema-fields'
 slug: 'remove-legacy-ticket-schema-fields'
 title: 'Remove legacy Ticket schema fields and intake compatibility'
-status: 'open'
+status: 'closed'
 kind: 'task'
 priority: 'P1'
 labels: ['ticket', 'schema', 'migration', 'cleanup']
-workflow_state: 'inprogress'
+workflow_state: 'done'
 created_at: '2026-06-08T10:38:42Z'
-updated_at: '2026-06-08T12:45:30Z'
+updated_at: '2026-06-08T12:49:24Z'
 assignee: null
 queued_by: 'workspace-panel'
 queued_at: '2026-06-08T11:21:33Z'
diff --git a/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/resolution.md b/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/resolution.md
new file mode 100644
index 00000000..2e08ff34
--- /dev/null
+++ b/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/resolution.md
@@ -0,0 +1,20 @@
+Implemented and merged.
+
+Summary:
+- Removed `legacy_ticket` from the current Ticket schema, metadata, summary, tool input/output, and CLI show/list/create surfaces.
+- Removed `needs_preflight` from current schema/API/panel/tool output surfaces.
+- Removed legacy `workflow_state: intake` compatibility; parser/tests now reject `intake` instead of normalizing it to `planning`.
+- Migrated local `.yoi/tickets/**/item.md` frontmatter to remove obsolete `legacy_ticket` entries, including non-null values explicitly authorized as obsolete migration breadcrumbs.
+- Preserved historical thread/resolution prose as audit history where it is not current schema/API input.
+
+Implementation:
+- Coder commit: `934a4b5 ticket: remove legacy schema fields`
+- Merge commit: `de8e973 merge: remove legacy ticket schema fields`
+- Reviewer approved with no blocking findings.
+
+Validation:
+- `cargo fmt --check`
+- `git diff --check`
+- `cargo run -q -p yoi -- ticket doctor`
+- `cargo check --workspace`
+- `nix build .#yoi`
diff --git a/.yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/thread.md b/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/thread.md
similarity index 92%
rename from .yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/thread.md
rename to .yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/thread.md
index a456ad26..b6cf5859 100644
--- a/.yoi/tickets/open/20260608-103842-remove-legacy-ticket-schema-fields/thread.md
+++ b/.yoi/tickets/closed/20260608-103842-remove-legacy-ticket-schema-fields/thread.md
@@ -274,4 +274,41 @@ Validation run by reviewer:
 
 All passed. No blocking findings.
 
+---
+
+<!-- event: state_changed author: hare at: 2026-06-08T12:49:24Z 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: 2026-06-08T12:49:24Z status: closed -->
+
+## 完了
+
+Implemented and merged.
+
+Summary:
+- Removed `legacy_ticket` from the current Ticket schema, metadata, summary, tool input/output, and CLI show/list/create surfaces.
+- Removed `needs_preflight` from current schema/API/panel/tool output surfaces.
+- Removed legacy `workflow_state: intake` compatibility; parser/tests now reject `intake` instead of normalizing it to `planning`.
+- Migrated local `.yoi/tickets/**/item.md` frontmatter to remove obsolete `legacy_ticket` entries, including non-null values explicitly authorized as obsolete migration breadcrumbs.
+- Preserved historical thread/resolution prose as audit history where it is not current schema/API input.
+
+Implementation:
+- Coder commit: `934a4b5 ticket: remove legacy schema fields`
+- Merge commit: `de8e973 merge: remove legacy ticket schema fields`
+- Reviewer approved with no blocking findings.
+
+Validation:
+- `cargo fmt --check`
+- `git diff --check`
+- `cargo run -q -p yoi -- ticket doctor`
+- `cargo check --workspace`
+- `nix build .#yoi`
+
+
 ---