chore: remove stale sst-env.d.ts artifacts

[markijbema]

What

Deletes the 9 committed sst-env.d.ts files across packages.

Why

These are auto-generated SST type stubs. Each contains:

/// <reference path="../../sst-env.d.ts" />
import "sst"

Both are dead:

• the referenced root sst-env.d.ts does not exist (and there is no sst.config.ts in the repo), and
• the sst package was removed in chore: remove 33 unused dependencies across monorepo #10993, so import "sst" no longer resolves.

They are excluded from typecheck (CI is green without sst), so this is purely removing dead files. Kilo is CLI-only with no hosted platform; the upstream-merge tooling already lists sst-env.d.ts in skipFiles (script/upstream/utils/config.ts), so these won't be re-added on the next upstream sync.

Follow-up to the review of #10993.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (9 files)

• packages/core/sst-env.d.ts
• packages/http-recorder/sst-env.d.ts
• packages/llm/sst-env.d.ts
• packages/opencode/sst-env.d.ts
• packages/plugin/sst-env.d.ts
• packages/script/sst-env.d.ts
• packages/sdk/js/sst-env.d.ts
• packages/storybook/sst-env.d.ts
• packages/ui/sst-env.d.ts

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_{Review guidance: REVIEW.md from base branch main}