REMOTE-1727 Surface artifact upload root cause

[jasonkeung]

Description

Preserves the actionable root cause when an artifact upload target request fails, so quota failures surface as an artifact upload limit message instead of only Failed to create file artifact upload target.

https://www.loom.com/share/2c05a308b87a42b981ea037234aca463

Linked Issue

REMOTE-1727

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

• cargo fmt --manifest-path /workspace/warp/Cargo.toml --all -- --check

• cargo test --manifest-path /workspace/warp/Cargo.toml -p warp format_upload_artifact_error

• I have manually tested my changes locally with ./script/run

Screenshots / Videos

Not applicable for this focused error-copy change.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-BUG-FIX: Artifact upload failures now surface actionable quota-limit details when upload limits are reached.

Co-Authored-By: Oz oz-agent@warp.dev

Conversation: https://staging.warp.dev/conversation/aa254ad4-a7ab-49b0-95d6-5af18280c54b
Run: https://oz.staging.warp.dev/runs/019e42ff-b61e-73ae-b998-29f13642cd6d
Plans:

• REMOTE-1727 Artifact Upload Limit Error Surfacing

This PR was generated with Oz.

[oz-for-oss]

@jasonkeung

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[oz-for-oss]

Overview

This PR updates artifact upload action error formatting so failures with nested causes surface the actionable root cause, and adds unit coverage for quota-limit and single-layer error cases. I did not find correctness or security issues in the changed Rust logic itself, and there is no approved spec context to validate against.

Concerns

• The change affects user-visible error copy/behavior, but the PR description only says screenshots/videos are not applicable. Per the repo review guidance, please attach a screenshot or short recording demonstrating the failed artifact upload path end to end, showing that the quota-limit root cause is surfaced.

Verdict

Found: 0 critical, 1 important, 0 suggestions

Request changes

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