Align repeat authoring with Promptfoo numeric repeat

[christso]

Summary

• remove the public object-shaped repeat authoring surface (count, strategy, early_exit, cost_limit_usd) from core validation/parsing, CLI run-policy wiring, and SDK authoring
• keep numeric evaluate_options.repeat: N and numeric scoped repeat overrides while preserving internal sample artifact metadata
• update public docs, examples, ADR/plans, and agent guidance to describe numeric repeat only and mark the old strategy surface as superseded

Validation

• bun --filter @agentv/core build
• bun --filter @agentv/sdk build
• bun --filter agentv build
• bun test packages/sdk/test/eval-authoring.test.ts packages/core/test/evaluation/experiment.test.ts packages/core/test/evaluation/eval-inline-experiment.test.ts packages/core/test/evaluation/validation/eval-validator.test.ts packages/core/test/evaluation/validation/eval-file-schema.test.ts packages/core/test/evaluation/loaders/jsonl-parser.test.ts packages/core/test/evaluation/loaders/ts-eval-loader.test.ts apps/cli/test/eval.integration.test.ts
• bun run lint
• git diff --check
• bun apps/cli/src/cli.ts validate examples/features/trials/evals/suite.yaml
• bun --filter @agentv/web build
• bun --filter @agentv/web check:routes

Live dogfood

• Ran a temporary live eval using LOCAL_OPENAI_PROXY_BASE_URL=http://127.0.0.1:10531/v1, provider local-openai, grader provider local-openai-grader, and evaluate_options.repeat: 2.
• Result: PASS, 1/1 scored 100%.
• Bundle confirmed two samples: sample-1 and sample-2, with samples[].sample_index 0 and 1 and aggregate total_samples: 2.

Beads: av-s96i, av-s96i.1, av-s96i.2.

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