chore(deps): 升级 dsh peers 到 0.2.0-rc.2 / upgrade dsh peers to 0.2.0-rc.2

[auto-wood]

Summary / 摘要

• Upgrade @deepseek-ai/dsh-* peers to ^0.2.0-rc.2 for corridor dsh-v0.2.0-rc.1 → dsh-v0.2.0-rc.2.
• 将 @deepseek-ai/dsh-* peers 升级到 ^0.2.0-rc.2（走廊 dsh-v0.2.0-rc.1 → dsh-v0.2.0-rc.2）。
• Deferred Mode C — notes/notify already ran earlier; this PR opens after npm published @deepseek-ai/dsh@0.2.0-rc.2 (next dist-tag).
• 延期 Mode C：笔记/通知已先完成；本 PR 在 npm 发布 @deepseek-ai/dsh@0.2.0-rc.2（next dist-tag）之后补开。

Changes / 变更

• All @deepseek-ai/dsh-* peers → ^0.2.0-rc.2.
• Refresh pnpm-lock.yaml (626× 0.2.0-rc.2, zero 0.2.0-rc.1 residue).
• pnpm-workspace.yaml: minimumReleaseAgeExclude append || 0.2.0-rc.2; packageExtensions for ui-primitives → 0.2.0-rc.2 + util-code-language ^0.2.0-rc.2.
• README dsh badge → 0.2.0--rc.2; docs / peer-deps test / related prose pins updated.
• .changes/unreleased/upgrade-dsh-0-2-0-rc-2-peers.md.

Corridor / 走廊

• Release: https://github.com/deepseek-ai/deepseek-harness/releases/tag/dsh-v0.2.0-rc.2
• Compare: deepseek-ai/deepseek-harness@dsh-v0.2.0-rc.1...dsh-v0.2.0-rc.2
• Themes: desktop menu-bar bundled dsh install; experimental async Q&A; model-picker fuzzy search; UX/desktop fixes; pi-ai → 0.87.1.
• No source API migration — peer cohort / docs / lock bump only.

Validation / 验证

• pnpm install --frozen-lockfile ✓
• pnpm typecheck ✓
• pnpm test — 59 files / 1403 passed / 8 skipped ✓

Do not merge — Auto.Wood Mode C bump only.