iter57 cluster-067-942: 删 AGUI EventChannel dead surface (#942)

[loning]

摘要

iter57 cluster-067-942(severity:medium)— 删 AGUI EventChannel dead surface

• Old:AGUIEventChannel + IAGUIEventChannelSink + AGUIEventChannelOptions 是 dead surface(已被 CQRS/projection 的 AGUIEvent streams 替代,但 type 仍留)
• New:删 dead surface,保留 active AGUISseWriter path,Presentation 仅序列化经 CQRS/projection 的 AGUIEvent streams

违反:CLAUDE.md「删除优先」「重复抽象」

Scope

• 删 AGUIEventChannel.cs、AGUIEventChannelOptions.cs、IAGUIEventSink.cs、AGUIEventChannelTests.cs
• AGUISseWriter.cs + README.md 更新

local PASS:architecture + test_stability + dotnet build(0 errors)

closes #942

🤖 Generated with Claude Code via codex-refactor-loop iter57

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[loning]

📊 状态卡片 — reviewer 派出

维度	值
阶段	派出 codex(role=reviewer)
codex log	review-pr945-omnibus-r1.log
工作目录	/Users/auric/aevatar
timeout	5400s(~90 min 上限)
上下文	omnibus r1 派
下一步自动会做	1. 三 reviewer 完成 verdict marker 2. controller 计算 consensus 3. unanimous → auto-merge / reject → fix r<N+1>
是否需要人介入	❌ 否(自动推进)

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[loning]

📊 codex 进展 review-pr945-omnibus-r1 (⏳ 进行中; 已跑 6 min)

 succeeded in 971ms:
codex
approve

未发现 blocker。PR scope 干净：删除 `AGUIEventChannel` / `IAGUIEventSink` / `AGUIEventChannelOptions` 及其测试，PR head 上无残留引用；`AGUISseWriter` 活跃路径仍有 `AGUISseWriterTests` 覆盖，无 `[Skip]`。

验证：
- `bash tools/ci/architecture_guards.sh` 通过
- `bash tools/ci/test_stability_guards.sh` 通过
- `dotnet test ... --filter FullyQualifiedName~AGUISseWriterTests --nologo` 通过，3 passed
- `dotnet build aevatar.slnx --nologo` 通过，0 errors

REVIEW_DONE:945:omnibus:approve
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approve

未发现 blocker。PR scope 干净：删除 `AGUIEventChannel` / `IAGUIEventSink` / `AGUIEventChannelOptions` 及其测试，PR head 上无残留引用；`AGUISseWriter` 活跃路径仍有 `AGUISseWriterTests` 覆盖，无 `[Skip]`。

验证：
- `bash tools/ci/architecture_guards.sh` 通过
- `bash tools/ci/test_stability_guards.sh` 通过
- `dotnet test ... --filter FullyQualifiedName~AGUISseWriterTests --nologo` 通过，3 passed
- `dotnet build aevatar.slnx --nologo` 通过，0 errors

自动更新每 10 分钟;edit-in-place 不堆评论;codex 完成后此 comment 自动删除(per Auric "完成后删掉就好了 否则太占空间")。
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.51%. Comparing base (f82a239) to head (3aee36a).
⚠️ Report is 35 commits behind head on auto-refact-dev.

@@                 Coverage Diff                 @@
##           auto-refact-dev     #945      +/-   ##
===================================================
+ Coverage            82.83%   83.51%   +0.68%     
===================================================
  Files                  998      986      -12     
  Lines                63092    63608     +516     
  Branches              8161     8215      +54     
===================================================
+ Hits                 52261    53123     +862     
+ Misses                7304     6923     -381     
- Partials              3527     3562      +35     

Flag	Coverage Δ
ci	83.51% <ø> (+0.68%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/Aevatar.Presentation.AGUI/AGUISseWriter.cs	100.00% <ø> (ø)

... and 69 files with indirect coverage changes

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