ticket: approve mcp stdio lifecycle client

.yoi/tickets/00001KVHR3WRY/item.md

@@ -2,7 +2,7 @@
 title: 'MCP: implement stdio JSON-RPC lifecycle client'
 state: 'inprogress'
 created_at: '2026-06-20T05:30:04Z'
-updated_at: '2026-06-20T07:55:55Z'
+updated_at: '2026-06-20T07:58:02Z'
 assignee: null
 readiness: 'implementation_ready'
 risk_flags: ['mcp', 'stdio', 'json-rpc', 'process-lifecycle', 'diagnostics']

.yoi/tickets/00001KVHR3WRY/thread.md

@@ -266,3 +266,39 @@ Next action:
 - Route back to Reviewer for r2 verification of the redacted `Debug` blocker and final acceptance criteria。
 
 ---
+
+<!-- event: review author: yoi-reviewer-00001KVHR3WRY-r1 at: 2026-06-20T07:58:02Z status: approve -->
+
+## Review: approve
+
+Verdict: `approve`
+
+確認範囲:
+- Ticket authority / Orchestrator IntentPacket。
+- r2 fix diff: `a114fa9d..f396e1a2`。
+- 全体実装 diff: `c0e760d7..f396e1a2`。
+- 主な対象: `crates/mcp/src/stdio.rs`, `crates/mcp/tests/stdio_lifecycle.rs`, new crate/workspace/package changes, ToolRegistry/resource/prompt registration leakage の有無。
+
+Previous blocker verification:
+- `McpStdioServerSpec` no longer derives `Debug`; it is `Clone` only。
+- Custom `fmt::Debug` now redacts env values and prints only non-sensitive metadata / env keys / `redaction_count`。
+- `redactions` contents are not printed。
+- Regression test confirms `format!("{spec:?}")` includes useful non-sensitive metadata and excludes plaintext env-like values。
+
+Blocking issues: none。
+
+Non-blocking concerns / follow-ups:
+- None blocking for this Ticket。Implementation remains scoped to stdio lifecycle/protocol foundations and does not add ToolRegistry/resource/prompt registration or remote/OAuth surfaces。
+
+Reviewer validation:
+- `git diff --check c0e760d7..HEAD`: passed。
+- `cargo fmt --check`: passed。
+- `cargo test -p mcp`: passed; 5 tests passed including redacted Debug regression。
+- `cargo check`: passed。
+- `cargo tree -p mcp --depth 1`: inspected; dependencies limited to `libc`, `manifest`, `secrets`, `serde`, `serde_json`, `thiserror`, `tokio`; no product façade dependency。
+- `nix build .#yoi --no-link`: passed。
+- Additional grep found no added ToolRegistry/resource/prompt registration or remote/OAuth/HTTP scope creep。
+
+Worktree status at review end: clean。
+
+---