From 4dcb4a45d6034395e159f68466a60604f00ef423 Mon Sep 17 00:00:00 2001
From: altair823 <dlsrks0734@gmail.com>
Date: Sun, 31 May 2026 11:41:32 +0000
Subject: [PATCH] =?UTF-8?q?feat(config):=20migrate=20=EB=AA=A8=EB=93=88=20?=
 =?UTF-8?q?=EC=8A=A4=EC=BA=90=ED=8F=B4=EB=94=A9=20+=20toml=5Fedit=20?=
 =?UTF-8?q?=EC=9D=98=EC=A1=B4=EC=84=B1?=
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 Cargo.lock                         |  1 +
 crates/kebab-config/Cargo.toml     |  1 +
 crates/kebab-config/src/lib.rs     |  1 +
 crates/kebab-config/src/migrate.rs | 47 ++++++++++++++++++++++++++++++
 4 files changed, 50 insertions(+)
 create mode 100644 crates/kebab-config/src/migrate.rs

diff --git a/Cargo.lock b/Cargo.lock
index a50a47e..52a0e3a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4371,6 +4371,7 @@ dependencies = [
  "tempfile",
  "thiserror 2.0.18",
  "toml",
+ "toml_edit 0.22.27",
  "tracing",
 ]
 
diff --git a/crates/kebab-config/Cargo.toml b/crates/kebab-config/Cargo.toml
index 914f576..b92b1f6 100644
--- a/crates/kebab-config/Cargo.toml
+++ b/crates/kebab-config/Cargo.toml
@@ -15,6 +15,7 @@ serde        = { workspace = true }
 serde_json   = { workspace = true }
 thiserror    = { workspace = true }
 toml         = "0.8"
+toml_edit    = "0.22"
 dirs         = "5"
 # p9-fb-05: warn-log when current_dir() fails (chroot, deleted cwd)
 # during workspace.root resolution.
diff --git a/crates/kebab-config/src/lib.rs b/crates/kebab-config/src/lib.rs
index 568ff45..aa69ef2 100644
--- a/crates/kebab-config/src/lib.rs
+++ b/crates/kebab-config/src/lib.rs
@@ -9,6 +9,7 @@ use std::path::{Path, PathBuf};
 use serde::{Deserialize, Serialize};
 
 mod paths;
+pub mod migrate;
 pub use paths::{expand_path, expand_path_with_base};
 
 /// Signal: `Config::from_file` / `Config::load` failed due to missing path,
diff --git a/crates/kebab-config/src/migrate.rs b/crates/kebab-config/src/migrate.rs
new file mode 100644
index 0000000..8985f06
--- /dev/null
+++ b/crates/kebab-config/src/migrate.rs
@@ -0,0 +1,47 @@
+//! config.toml 마이그레이션 엔진 (순수 변환, I/O 없음).
+//!
+//! 두 메커니즘: (1) reconciliation — default 구조에 있고 사용자 파일에
+//! 없는 섹션/키를 주석과 함께 추가. (2) step 체인 — schema_version 기반
+//! non-additive 변환(deprecated 제거 등). 자세한 계약은 spec
+//! `docs/superpowers/specs/2026-05-31-config-migration-design.md`.
+
+use serde::Serialize;
+
+/// 현재 바이너리가 이해하는 config 스키마 버전. 마이그레이션 완료 시
+/// 사용자 파일의 `schema_version` 을 이 값으로 stamp 한다.
+pub const CURRENT_SCHEMA_VERSION: u32 = 2;
+
+/// 한 번의 마이그레이션에서 발생한 개별 변경.
+#[derive(Clone, Debug, PartialEq, Serialize)]
+pub struct MigrationChange {
+    pub kind: ChangeKind,
+    /// dotted path, 예: `ingest.expansion`, `workspace.include`.
+    pub path: String,
+    /// 사람·wire 용 한 줄 설명.
+    pub detail: String,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum ChangeKind {
+    AddedSection,
+    AddedKey,
+    RemovedDeprecated,
+}
+
+/// 마이그레이션 결과 요약(순수 변환 단계 산출). I/O 계층이 backup_path
+/// 등을 채워 wire 로 내보낸다.
+#[derive(Clone, Debug, PartialEq, Serialize)]
+pub struct MigrationOutcome {
+    pub from_schema_version: u32,
+    pub to_schema_version: u32,
+    pub changes: Vec<MigrationChange>,
+    /// 변환 후 직렬화된 새 문서 텍스트(멱등 시 입력과 동일).
+    pub new_text: String,
+}
+
+impl MigrationOutcome {
+    pub fn changed(&self) -> bool {
+        !self.changes.is_empty()
+    }
+}