chore: prepare GoodBuddy 0.12.7 and Agent 0.11.21 releases

Set the approved Desktop and Agent versions and package the approved Chinese
and English notes without changing published release history. Keep OpenCode
pinned to 1.18.29 and require Desktop 0.12.7 before the new Agent package.

Align both feature lists and affected design documents with reference-image
editing, inherited expert work modes, preview boundaries, and remaining
release acceptance. Application navigation remains design-only. No LoongArch
preview is planned for this release; Agent publication remains non-Latest.

The first candidate full run exposed a browser test clicking Send before it
was enabled. Wait for startup readiness using the existing test convention;
production code is unchanged by this release-preparation commit.

Validation: final full suite 3597 passed, 0 failed, 61 skipped across 338 files.
Typecheck, lint, bilingual release-note validation, version consistency,
unchanged historical notes, whitespace and relative-link checks passed.
No additional real model calls, local production builds, pushes or tags.
Concurrent navigation, workbar and roadmap design edits are not included.

docs/features/direct-model-agent/prd.md

@@ -17,8 +17,9 @@ GoodBuddy 直连模型已经可以读取、列出和写入工作区文本，使
 分配的 MCP，但没有内置命令执行工具。模型可以生成代码，却不能运行构建、测试、格式化、
 Git 或项目脚本，因此无法独立验证结果。
 
-GoodBuddy 也已经有面向用户专家协作的只读 Subagent，但直连模型不能在自己的工具循环中
-主动委派一个聚焦的编程子任务。OpenCode、Continue 和 DeepSeek Harness 一般已经提供
+本功能设计时，GoodBuddy 已有面向用户专家协作的只读 Subagent，但直连模型尚不能在工具
+循环中主动委派编程子任务。当前专家协作已继承父请求 Ask/Execute 模式并使用本机直连模型
+工具，与本功能的 `subagent_delegate` 仍为不同入口。OpenCode、Continue 和 DeepSeek Harness 一般已经提供
 Shell、Agent 或 Task 能力，再向它们注入 GoodBuddy 同名工具只会造成重复入口和语义冲突。
 
 本功能只补齐直连模型缺少的基础 Agent 能力：