fix(cloud-artifacts): make Env stubs actually take effect in CI

The previous stub file (2e29e362) wrapped `interface Env` in
`declare global { ... }`, but the file has no top-level import/export so
it's a script, not a module. TS2669 forbids `declare global` in scripts,
and in .d.ts files that error is silently swallowed — so the Env stubs
were never merged into the global scope. Locally typecheck passed only
because worker-configuration.d.ts (gitignored) provided Env separately;
in CI / fresh clones, `BUCKET`, `MAX_BYTES`, `DEFAULT_TTL_DAYS`,
`PUBLIC_URL` were all missing on Env.

Drop the wrapper. Top-level `interface Env` in a script .d.ts is already
global ambient and merges with worker-configuration.d.ts via interface
declaration merging, so both environments typecheck cleanly.

Co-Authored-By: glm-5.2 <zai-org@claude-code-best.win>

packages/cloud-artifacts/src/types.d.ts

@@ -90,13 +90,15 @@ interface ExportedHandler<Env = unknown> {
 // Wrangler-generated worker-configuration.d.ts supplies TOKEN via `wrangler secret put`.
 // This declaration provides the R2 binding + wrangler vars so the Worker compiles
 // without the generated file.
-
-declare global {
-  interface Env {
-    BUCKET: R2Bucket
-    TOKEN: string
-    MAX_BYTES: string
-    DEFAULT_TTL_DAYS: string
-    PUBLIC_URL: string
-  }
+//
+// NOTE: 这个文件是脚本（没有 top-level import/export），顶层 interface 自动是 global
+// ambient，会和 worker-configuration.d.ts 的 `interface Env` 走 interface declaration
+// merging。不要用 `declare global { ... }` 包裹——脚本文件里那种写法是 TS2669 错误，
+// 在 .d.ts 里甚至会被静默吞掉，导致 Env 桩完全不生效（CI 上就是这种情况）。
+interface Env {
+  BUCKET: R2Bucket
+  TOKEN: string
+  MAX_BYTES: string
+  DEFAULT_TTL_DAYS: string
+  PUBLIC_URL: string
 }