feat(model+spec): .cph-version 契约文件 + CphVersionMismatch 诊断(ADR-0016);bump 0.0.2

教研工程文件根放 .cph-version(内容=面向的 cph 版本)。cph 加载时比对自身版本
(CARGO_PKG_VERSION),不相容报 CphVersionMismatch error 并拒绝。当前判定为版本完全
相等(MVP);判定逻辑孤立在 versions_compatible 单谓词,后续可放宽为 semver 区间而
不动诊断分类/spec/CLI。

spec(7 类诊断,原 6 类):
- Diagnostic.lean: DiagKind 增 cphVersionMismatch(error 级),分类注释 6→7
- Pipeline.lean: load 阶段含 .cph-version 兼容性判定
- Courseware.lean: ADR 区间 →0016

实现:
- cph-diag: DiagCode::CphVersionMismatch("E-CPH-VERSION")
- cph-model: load() 解析 manifest 成功后 check_cph_version;versions_compatible
  谓词(完全相等);CPH_VERSION const。missing .cph-version 暂跳过(迁移期 OPEN);
  空文件报 error
- examples/TH-141、valid/mini fixture、KenKen 课各加 .cph-version=0.0.2

测试:cph-model 4 个版本门测试;全 workspace 53 passed;lake 25 jobs 绿。
负向验证:9.9.9 .cph-version → E-CPH-VERSION error + check 拒绝(exit 1)。

bump: workspace.package 0.0.1→0.0.2;cph --version 报 cph 0.0.2;README 同步
(含版本契约说明)。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -395,7 +395,7 @@ dependencies = [
 
 [[package]]
 name = "cph-check"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "cph-diag",
  "cph-model",
@@ -405,7 +405,7 @@ dependencies = [
 
 [[package]]
 name = "cph-cli"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "clap",
  "clap_complete",
@@ -416,14 +416,14 @@ dependencies = [
 
 [[package]]
 name = "cph-diag"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "cph-model"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "cph-diag",
  "serde",
@@ -432,7 +432,7 @@ dependencies = [
 
 [[package]]
 name = "cph-schema"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "cph-diag",
  "cph-model",
@@ -442,7 +442,7 @@ dependencies = [
 
 [[package]]
 name = "cph-typst"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "cph-diag",
  "cph-model",