fix(trg): carry a named grader's fields through the published report

[yordis]

• A grader given a name in the suite lost that name by the time it reached report.json, so a reader could not tell which of several graders on the same assertion produced a result.
• The report was assembled by serializing a result and then adding keys to the map, which silently dropped everything down the path where the value was not an object. Expressing the published shape as a type removes that path rather than guarding it.

Stacked on #150.

[cursor]

PR Summary

Low Risk
Report assembly change only; behavior is more complete serialization with regression tests, no auth or runtime path changes.

Overview
Fixes lossy merge of per-run grading into report.json. After eval grade, assertion_results used to be rebuilt field-by-field from each run’s grading.json, so stable grader metadata—name, excluded, rationale, and votes—never reached the published report even when present on disk.

The merge now serializes a PublishedAssertionResult type: run_id and eval_case_id plus a flattened AssertionGradeResult, so new result fields stay in sync with serde rules (optional keys like name still omitted when unset). Reference docs for report.json assertion_results are updated to match.

Tests assert unnamed prose assertions do not gain a name in report.json, and that named/excluded/multi-vote results survive the flatten end-to-end.

^{Reviewed by Cursor Bugbot for commit bd2c2a4. Bugbot is set up for automated code reviews on this repo. Configure here.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 4050107 and bd2c2a4.

📒 Files selected for processing (2)

• crates/trg/docs/reference/ai-skills-eval.md
• crates/trg/src/agentskills/grading.rs

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