fix/transcript-404-empty-reason

[shayomi]

## ✅ Checklist

- [x] I have followed every applicable step in the [contributing guide](https://github.com/triggerdotdev/trigger.dev/blob/main/CONTRIBUTING.md)
- [x] The PR title follows the convention
- [ ] I ran and tested the code works

> Testing is pending because the local clone does not currently have the required Node.js 24.18.0 runtime or workspace dependencies installed.

---

## Testing

Added a regression test that starts a raw TCP server and returns this valid HTTP response:

```http
HTTP/1.1 404
Content-Length: 0
Connection: close

The response intentionally has an empty reason phrase. The test calls ObjectStoreClient.getObjectResponse() and verifies that the resulting error is recognized by isTranscriptNotFound().

Static verification completed:

git diff --check

Before marking this PR ready for review, run:

pnpm --filter webapp run test ./app/services/realtime/transcriptDownload.server.test.ts --run
pnpm run format
pnpm run lint
pnpm run knip

---

Changelog

Missing transcript downloads now return a not-found response when the object store responds with HTTP 404 without a reason phrase.

Implementation

The aws4fetch object-store adapter previously created download errors using only response.statusText. Since HTTP reason phrases are optional, a valid 404 response could produce an error message with no "Not Found" text.

The adapter now preserves the numeric HTTP status on the error. Transcript error classification checks that status first while retaining the existing AWS SDK and message-based fallbacks.

A .server-changes/ entry is included because this is a user-visible webapp bug fix.

---

Screenshots

Not applicable. This change affects transcript-download error handling and has no visual UI changes.

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[github-actions]

Hi @shayomi, thanks for your interest in contributing!

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Reviewing files that changed from the base of the PR and between 6f671f1 and 11cda9e.

📒 Files selected for processing (4)

• .server-changes/transcript-download-empty-reason-404.md
• apps/webapp/app/services/realtime/transcriptDownload.server.test.ts
• apps/webapp/app/services/realtime/transcriptDownload.server.ts
• apps/webapp/app/v3/objectStoreClient.server.ts

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🔍 Release note describes infrastructure, not user behavior

The changelog note names the object store and HTTP reason phrase. The release-note guidance calls for describing the visible change without internal infrastructure.

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