fix(results): tighten result artifact contract

[christso]

Summary

AgentV result bundles now expose the current tags-first contract without the leftover experiment/config compatibility fields from the first cleanup pass. Run summaries keep experiment as run metadata and keep runtime_source focused on runtime provenance: schema_version, config_source, eval_files, and optional wrapper_eval_file.

This removes the redundant public fields called out in av-xz5i: root summary.json pass_at_k, duplicated experiment namespace/source metadata, runtime_source.kind, source_eval_files, and the public .internal/run-config.json / experiment_config path. Dashboard, serve, report, docs, and artifact-writer tests now consume that slimmer shape directly.

Comparable-framework check: Promptfoo and Margin keep machine duration fields in milliseconds (durationMs/latencyMs, runtime_ms/run_ms), while Vercel agent-eval converts agent milliseconds into seconds for result duration display. AgentV keeps machine-readable durations in ms and leaves human seconds to renderers.

Related: av-xz5i

Validation

• bun run build
• bun run typecheck
• bun test apps/cli/test/commands/eval/artifact-writer.test.ts apps/cli/test/commands/eval/tag-filtering.test.ts
• bun test apps/cli/test/commands/results/report.test.ts apps/cli/test/commands/results/serve.test.ts
• bun test apps/dashboard/src/lib/run-detail-context.test.ts apps/dashboard/src/components/RunList.mobile.spec.tsx
• bun test apps/cli/test/eval.integration.test.ts
• live dogfood: bun apps/cli/src/cli.ts eval run examples/features/rubric/evals/operators.eval.yaml --target azure --grader-target azure --test-id finance-summary-operator-guards --workers 1 --experiment av-xz5i-dogfood --output .agentv/results/av-xz5i-contract-dogfood-azure-20260704 --no-cache passed 1/1 with a live Azure target and Azure LLM rubric grader

Evidence

Private evidence branch: EntityProcess/agentv-private@evidence/av-xz5i-result-artifact-contract-2026-07-04 (862965c). It includes the passed dogfood run bundle, source eval, and contract inspection notes showing the removed fields are absent from the generated public artifact bundle.

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