ticket: close base32 id migration

.yoi/tickets/00001KTNMN02R/thread.md

@@ -229,3 +229,49 @@ Validation run by reviewer and passed:
 Result: approve, merge-ready. Residual risk: migration map intentionally retains old ID strings for audit; not a blocker.
 
 ---
+
+<!-- event: state_changed author: hare at: 2026-06-09T13:25:54Z from: inprogress to: closed reason: closed field: state -->
+
+## State changed
+
+Ticket を closed にしました。
+
+
+---
+
+<!-- event: close author: hare at: 2026-06-09T13:25:54Z status: closed -->
+
+## 完了
+
+Merged and closed.
+
+Implementation:
+- Added shared `crates/project-record` helper for canonical project record IDs.
+- Ticket and Objective creation now use the same fixed-width base32 Unix epoch millisecond ID allocator.
+- IDs use alphabet `0123456789ABCDEFGHJKMNPQRSTVWXYZ` and width 13.
+- Collision handling retries by `+1ms` path probe, bounded at 1000 attempts, with no suffix/counter/random tail.
+- `created_at` / `updated_at` remain human-readable frontmatter fields; collision-adjusted ID timestamp is not silently written as `created_at`.
+- Migrated current repository records: 173 Ticket directories and 1 Objective directory.
+- Updated relation artifacts, orchestration-plan artifacts, Objective linked Tickets, docs/examples/tests, package metadata, and Nix cargo hash.
+- Added audit mapping artifact at `.yoi/tickets/00001KTNMN02R/artifacts/id-migration-map.txt`.
+
+Commits:
+- `4203988 feat: unify project record ids`
+- merge: `5f6c695 merge: unify project record ids`
+
+Review:
+- Reviewer approved with no request-change findings.
+- Residual note: `id-migration-map.txt` intentionally retains old ID strings as audit evidence. It is under artifacts and does not affect schema/list/doctor behavior.
+
+Post-merge validation:
+- `cargo test -q -p project-record`
+- `cargo test -q -p ticket`
+- `cargo test -q -p yoi objective_cli`
+- `cargo fmt --check`
+- `git diff --check`
+- `cargo run -q -p yoi -- ticket doctor`
+- `cargo run -q -p yoi -- objective doctor`
+- `cargo check --workspace`
+- `nix build .#yoi --no-link`
+
+---