fix(updates): keep the update retry budget and report unavailable updates

[lpmasser]

Summary

问题：标题栏的更新提示可能无限重复发送失败的 codexhost/update/check 请求。在源码构建上，Host 日志里出现了大量重复的失败更新请求。原因有两个：

1. scheduleUpdateRetry 在 UPDATE_RETRY_DELAYS_MS 用完后直接返回，但调用方在此之前已经把 checkedUpdateClient 置成 null。之后每次普通的 DOM 刷新触发 refreshUpdateIndicator()，都会重新发起一次检查，绕过了重试上限。
2. 没有更新协调器的 Runtime（npm start 的源码构建，以及其他不带更新器的组合）对 update/check 返回 RPC 错误 -32090，提示逻辑把它当成临时失败继续重试。

改动：

• 只在确实安排了下一次重试时才重置 checkedUpdateClient；重试次数用完后保持用完，直到 client 变化。
• 没有更新协调器时，codexhost/update/check 返回 result: null。update/start 和 update/status 仍返回 -32090，所以用 update/status 探测远程 Host 的 classifyRemoteHostProbeResponse 不受影响。
• Renderer 接受 UpdateCheckResult | null：提示逻辑把 null 当作最终结果（没有更新），更新页显示已有的“未安装”不可用状态。

null 是一个小的契约新增。如果更希望返回带类型的 “unsupported” 结果，我可以改。

Related issues

N/A

Test plan

基线 upstream/main@4052cf49（v0.10.2），macOS arm64，Node 24.21.0，npm ci。

• 新增/修改 6 项测试：结构化错误耗尽重试、请求被拒耗尽重试、提示逻辑处理 null、model client 接受 null、更新页显示不可用、Host 在无协调器时的应答。只把生产代码换回 main，6 项全部失败；加上修复后通过。
• npm run typecheck、node tools/check-boundaries.mjs、改动文件的 ESLint / Prettier、git diff --check：通过。
• packages/host-runtime + packages/renderer-extension 全部测试：1,172 通过，5 跳过（先执行了 npm run build:plugins）。

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Reviewing files that changed from the base of the PR and between ac4acf3 and d23a807.

📒 Files selected for processing (2)

• packages/renderer-extension/src/settings/pages.ts
• packages/renderer-extension/test/settings/pages.test.ts

🚧 Files skipped from review as they are similar to previous changes (2)

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• packages/renderer-extension/src/settings/pages.ts

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📝 Summary

Summary by CodeRabbit

• 功能更新
  • 当当前环境不支持检查更新时，设置页面会显示“更新能力不可用”，不再展示版本详情或更新操作。
  • 更新检查不可用时不再重复重试；检查失败时仍会按既有规则重试。

Walkthrough

未配置更新协调器时，codexhost/update/check 返回 result: null。renderer 客户端、更新生命周期和设置页面处理该结果。start 和 status 仍返回 -32090。

Changes

更新检查空结果处理

Layer / File(s)	Summary
Host 响应与客户端解析 packages/host-runtime/src/app-server-host.ts, packages/host-runtime/test/app-server-host.projection-1.test.ts, packages/renderer-extension/src/renderer-model-client.ts, packages/renderer-extension/test/renderer-model-client.test.ts	未配置更新协调器时，Host 对 check 返回 null；start 和 status 仍返回 -32090。renderer 客户端接受并解析空结果。测试验证响应及请求转发行为。
更新检查生命周期 packages/renderer-extension/src/renderer-settings-lifecycle.ts, packages/renderer-extension/test/renderer-settings-lifecycle.test.ts	生命周期将空结果视为无更新提示，并重置重试状态。测试覆盖空结果、错误、请求拒绝及客户端替换后的检查行为。
设置页面不可用状态 packages/renderer-extension/src/settings/pages.ts, packages/renderer-extension/test/settings/pages.test.ts	检查结果为 null 时，设置页面显示运行时能力不可用状态，并清除过期版本和安装信息。测试覆盖不可用状态及重试后的界面更新。

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to d23a8

Update checks without a coordinator report unavailable status, while retries remain bounded. No identified issue prevents merging after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to ac4ac

The unavailable-updater response now flows across a public runtime boundary, but the reviewed paths preserve request validation and do not grant new update authority. No introduced security issue was established; deployment compatibility and some dependent coverage remain uncertain.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The changed response can affect update availability shown to a renderer connected to a Host without a coordinator. The reviewed branch does not expand update-start authority or change the status probe.

Trust Boundaries and Controls

• observed — The Host validates request parameters, and the renderer parses either a null response or a strictly shaped non-null result before consuming update fields.

Resilience and Maintainability Implications

• observed — Client absence and transport failures can preserve a previously displayed update-available value. This state-retention behavior exists independently of the new null response; the reviewed evidence does not establish whether it is intentional policy.

Hardening Proposals

• proposed — Specify whether the indicator should retain last-known availability when its client disappears or all transport retries fail, and test the chosen recovery policy.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题准确概括了主要变更：修复更新重试预算问题，并报告更新功能不可用状态。标题简洁且与改动相关。
Description check	✅ Passed	描述详细说明了重复更新检查的原因、重试逻辑修复、无更新协调器时的响应变化、Renderer 行为及测试结果。内容与变更集直接相关。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@packages/renderer-extension/src/settings/pages.ts`:
- Around line 501-503: Update renderUnavailable so a null check result clears
stale version and installation values, hides manual update controls, and
restores the initial manual-update and release-link state before displaying the
unavailable status.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: BytePioneer-AI/codex-host/.coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between 4052cf4 and ac4acf3.

📒 Files selected for processing (8)

• packages/host-runtime/src/app-server-host.ts
• packages/host-runtime/test/app-server-host.projection-1.test.ts
• packages/renderer-extension/src/renderer-model-client.ts
• packages/renderer-extension/src/renderer-settings-lifecycle.ts
• packages/renderer-extension/src/settings/pages.ts
• packages/renderer-extension/test/renderer-model-client.test.ts
• packages/renderer-extension/test/renderer-settings-lifecycle.test.ts
• packages/renderer-extension/test/settings/pages.test.ts

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