docs(readme): 语气体检——去掉「正版登录」及同类防御腔与自我声明

- zh 模块表 auth 行：「Microsoft 正版登录」→「Microsoft 账户登录」，与英文 "Microsoft sign-in" 对齐
- zh/en：CLI 行去掉「完整可用」/ "is fully usable"（要读者相信的形容词）
- zh/en：CPU 软渲染兜底不再承诺「完整界面」/ "the full UI"，改为陈述渲染结果
- zh/en：轨道 B 首句去掉「没有任何…任何下载都拿不到它」/ "Nothing…no download contains it" 的双重否认，
  并与紧邻的「只能自己从源码编」合并为一句
- zh：轨道 A 小标题去掉「真能」的强调语气

README.md

@@ -28,8 +28,8 @@ attached to other agent tooling as an MCP server.
   dependency.
 - **Two UI stacks during the rewrite**: the released UI is Slint (Royalty-Free 2.0); the
   next-generation UI is iced 0.14 + Material 3 Expressive and is still being written (see Status).
-- **CPU software-rendering fallback**: `--software-renderer` gives the full UI on machines with no
-  usable GPU or with broken drivers.
+- **CPU software-rendering fallback**: `--software-renderer` keeps the interface rendering
+  normally on machines with no usable GPU or with broken drivers.
 - **AI agent + MCP**: chat, setting edits and crash diagnosis inside the launcher; `ull agent
   serve` exposes the same core as an MCP server (stdio or Streamable HTTP) to external agent tools.
 - **Mod loaders**: Fabric, Quilt, NeoForge, Forge, with modpack and CurseForge / Modrinth clients in
@@ -52,8 +52,8 @@ Two tracks. They are not the same product yet, so read the headings before downl
   already contain them.
 - **UI**: Slint + Metro. This is the shipped GUI — the instance, download, account, Java, log and
   settings pages drive the real engine (the in-app AI chat panel is a scripted placeholder).
-- **CLI `ull`** is built from the same tree at the same version and is fully usable — but the
-  `v0.1.0` assets ship only the GUI binary. If you want the CLI, build it yourself:
+- **CLI `ull`** is built from the same tree at the same version — but the `v0.1.0` assets ship
+  only the GUI binary. If you want the CLI, build it yourself:
   `cargo build --release --bin ull`. Commands: `instances`, `install`, `launch`, `accounts`,
   `sessions`, `logs`, `diag`, `config`, `java`, `agent`.
 - Windows ARM64 and Linux ARM64 slots are wired into the release pipeline; the next tagged release
@@ -61,8 +61,7 @@ Two tracks. They are not the same product yet, so read the headings before downl
 
 ### Track B — in progress on `dev`: next-generation UI (iced + Material 3 Expressive)
 
-**Nothing on this track is released, and no download contains it.** You can only see it by
-building from source.
+**This track is not released yet — you can see it only by building from source.**
 
 - **Locked direction**: the look is Material 3 Expressive and the framework is iced 0.14; the UI
   layer is written from scratch. Neither the style nor the framework will change again.