fix(build): keep console.error in production builds

[andrewck24]

What

removeConsole: true strips every console method from application code in production builds, including the console.error that withErrorHandler relies on to emit its structured error payload. Production server errors were therefore silent, and a domain 404 raised by a use case was indistinguishable from a Next routing 404 in the platform logs.

Excluding error restores that signal while still dropping log/warn/debug noise.

removeConsole:
  process.env.NODE_ENV === "production" ? { exclude: ["error"] } : false,

Why now

This is the direct reason the rally-404 bug (ATE-92) went misdiagnosed for two weeks — the structured error payload existed but never reached the platform logs. It is also a prerequisite for any error tracking work: an error reporter wired up on top of a build that strips console.error still receives nothing.

Scope notes

• One line in next.config.js. No application code, no behavior change for users.
• No changeset: zero user-visible impact (build configuration / operator-visible logging only), which is the documented exemption in .claude/skills/writing-changesets.
• No Blueprint Change: this predates a lifecycle Change and there is no durable knowledge to promote. It is the same lightweight-path gap tracked in ATE-109.
• The branch name carries the ate-92 prefix because the commit was authored during that investigation; the tracked issue is ATE-103.

Verification

pnpm verify:all passes locally (format, workflow checks, strict typecheck, lint, tests, pnpm build, service-worker assertion, blueprint build).

Refs ATE-103

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摘要（zh-TW）

removeConsole: true 會在 production build 移除所有 console 方法，連 withErrorHandler 用來輸出結構化錯誤內容的 console.error 也一併被移除，導致線上伺服器錯誤完全靜默，use case 拋出的領域 404 在平台日誌中與 Next 路由 404 無法區分。改為排除 error 後恢復此訊號，同時仍濾掉 log/warn/debug 噪音。

這正是 ATE-92（rally 送出一律 404）被誤診兩週的直接原因，也是後續接上錯誤追蹤的前提——在會 strip console.error 的 build 上接錯誤回報器仍然收不到任何東西。

僅動 next.config.js 一行，無使用者可見的行為變更，因此依 changeset 規範豁免不附 changeset；同理無 Blueprint Change 可歸檔（即 ATE-109 追蹤的輕量路徑缺口）。本地 pnpm verify:all 全綠。

[linear-code]

ATE-92

ATE-103

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