fix(eval): accept target id in targets files

[christso]

Summary

Live quickstart evals can now execute against checked-in targets.yaml files that use the current id target identity. Before this, the merged README/example contract validated but agentv eval run still rejected targets.yaml at runtime with Missing or invalid 'label' field.

This keeps name as the internal resolver key, rejects authored label/name at validation boundaries, and migrates the tracked target templates/examples to id so new projects and examples use the supported schema directly.

Related: av-kyv3

Validation

• bun test packages/core/test/evaluation/providers/targets-file.test.ts packages/core/test/evaluation/providers/targets.test.ts packages/core/test/evaluation/validation/targets-validator.test.ts packages/core/test/evaluation/loaders/config-loader.test.ts
• bun --filter @agentv/core build
• bun run validate:examples (107 valid, 0 invalid)
• bun run lint
• bun run typecheck
• git diff --check
• Live quickstart with local OpenAI-compatible endpoint and concurrency 2:
  LOCAL_OPENAI_PROXY_BASE_URL=http://127.0.0.1:10531/v1 LOCAL_OPENAI_PROXY_API_KEY=local-dummy-key LOCAL_OPENAI_PROXY_MODEL=gpt-5.3-codex-spark bun apps/cli/src/cli.ts eval run examples/features/readme-quickstart/evals/my-eval.eval.yaml --workers 2 --threshold 0.8 --verbose
• Live run bundle: .agentv/results/2026-07-04T03-57-29-236Z; result was PASS, 1/1 tests, mean score 100%, grading.json score 1 verdict pass with 5/5 assertion_results passing.

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