docs: update README for v2 governance and memory system

README.en.md

@@ -279,15 +279,15 @@ inkos write next my-book              # Draft → audit → auto-revise, all in
 inkos write next my-book --count 5    # Write 5 chapters in sequence
 ```
 
-If you want `write next` to always go through the `plan -> compose -> write` governance chain, set this in `inkos.json`:
+`write next` now uses the `plan -> compose -> write` governance chain by default. If you need the older prompt-assembly path, set this explicitly in `inkos.json`:
 
 ```json
 {
-  "inputGovernanceMode": "v2"
+  "inputGovernanceMode": "legacy"
 }
 ```
 
-The default remains `legacy` so existing projects do not silently change behavior.
+The default is now `v2`. `legacy` remains available as an explicit fallback.
 
 ### 2. Atomic Commands (Composable, External Agent Friendly)
 

README.md

@@ -249,15 +249,15 @@ inkos write next 吞天魔帝          # 写草稿 → 审计 → 自动修订
 inkos write next 吞天魔帝 --count 5 # 连续写 5 章
 ```
 
-如果希望 `write next` 也始终走 `plan -> compose -> write` 的输入治理链路，可在 `inkos.json` 中设置：
+`write next` 现在默认走 `plan -> compose -> write` 的输入治理链路。若你需要回退到旧的 prompt 拼装路径，可在 `inkos.json` 中显式设置：
 
 ```json
 {
-  "inputGovernanceMode": "v2"
+  "inputGovernanceMode": "legacy"
 }
 ```
 
-默认值仍为 `legacy`，避免旧项目无感升级时直接改变写作行为。
+默认值为 `v2`。`legacy` 仅作为显式 fallback 保留。
 
 ### 2. 原子命令（可组合，适合外部 Agent 调用）