feat(cli): support repeatable test-id filters

[christso]

Closes #924

Summary

• make agentv eval --test-id repeatable with OR matching
• pass multiple filters through the CLI and core loader/orchestrator pipeline
• add CLI integration and JSONL loader coverage
• clarify in AGENTS.md that issue branches must start from freshly updated main

Red/green UAT

• Red (main): agentv eval sample.test.yaml --test-id case-alpha --test-id case-beta exits with Too many times provided. Expected 1, got: 2.
• Green (this branch): the same command succeeds and runs exactly case-alpha and case-beta.

Verification

• bun test apps/cli/test/eval.integration.test.ts packages/core/test/evaluation/loaders/jsonl-parser.test.ts
• pre-push hook on git push passed: build, typecheck, lint, test, validate:examples

[cloudflare-workers-and-pages]

Deploying agentv with    Cloudflare Pages

Latest commit:	d77a199
Status:	✅  Deploy successful!
Preview URL:	https://9f439652.agentv.pages.dev
Branch Preview URL:	https://feat-924-repeatable-test-id.agentv.pages.dev

View logs