[earakely-scale]

Summary

Renderers no core step feeds. The task-instance viewer rendered metadata that only an outside plugin writes. Nothing in core produces any of these keys:

• per-model user-simulation tabs (trajectory_urls, output_urls, snapshot_urls, delivery scores, with trajectory / score / milestones / conversation-log subtabs);
• the task_data.user_intent Milestones tab;
• the completed_runs tab;
• a verifier result_s3_uri "Results" download.

Those tabs go, with their state, loaders, RawJsonPanel, FetchState and fetchRawS3Json, and the trigger-expansion state only they used. The tab bar now lists trajectories only, so BarDownload loses its kind.

Dead code.

• lib/materialize.ts has had no importer since the task runner's embedded-host mode went; it and its smoke cases go.
• The universe page's s3_url fallback never fires, because the explorer API's universe files always carry object_url.

Names.

• s3Uri → objectUrl (trajectory state, download entries, collected-zip jobs, artifact previews), _entryS3Uri → _entryObjectUrl, reviewerOverviewS3 → reviewerOverviewUrl.
• presignedUrl → contentUrl: it is the same-origin /api/v1/objects/content proxy, which a comment already called a leftover name.
• Comments say object URL / the store's CORS instead of S3 URI / bucket CORS.

No release needed: the UI source is excluded from the wheel.

Testing

• Typecheck, static export: pass.
• Lint: 59 warnings, all present on main (60 there). The usersim effect's missing-dependency warning goes; the newly unused trigger-expansion state was removed rather than left as a warning.
• Smoke: 14 ran, 2 skipped on their allowed capability reasons, 0 failed. bar-downloads.smoke.ts drops the Results cases; trajectory-url.smoke.ts drops the materialize cases.
• Chaos (built UI in headless Chrome, agent-env up on local stores, this branch vs main):
  • The twelve trajectory cases from feat(explorer): read prompt-response trajectory URLs under either key #102 render the same as before: S3-named / object-store / both / disagreeing / null keys, multi-turn with a failed turn, garbage values, four mixed responses collapsing to a dropdown, a missing object, core-written multi-turn.
  • Collected artifacts with a reviewer overview: the Overview tab's iframe loads the HTML through the content proxy, Collected Artifacts lists both files, and expanding notes.txt shows its text through the renamed ensureContentUrl path. Same as main.
  • An instance carrying every removed key: main shows Completed Runs, Milestones and a "Download Results" entry; this branch shows Verifier Results and Task Run Context only.
  • No uncaught exceptions in either build.

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge.

What we checked:

• Older universe files lose downloads: No. The universe API copies a stored s3_url into the object_url field the page reads, including when fetching a selected version.

Summary

The task-instance viewer drops tabs and downloads driven by metadata that core does not write, while keeping core trajectories and verifier results. The PR also updates object-store naming in the UI and removes an unused materialization helper.

• Task-instance views keep core trajectories and drop plugin-only panes.
• The viewer and artifact links use object-store names for file URLs.
• The unused task-runner materializer and its smoke cases are removed.

_{Reviews (1) · Last reviewed commit: "refactor(explorer): drop renderers no co..." · Reviewed by Greptile}