feat: add Vitest workspace verifier adapter

[christso]

Summary

AgentV deterministic workspace graders can now use normal Vitest verifier files and have each it(...) outcome mapped into AgentV code-grader assertions. The common path no longer needs a per-eval verify-*.mjs or defineVitestWorkspaceGrader() wrapper: eval YAML can call AgentV's built-in adapter directly with agentv eval vitest <verifier.test.ts>.

This keeps framework-specific behavior out of core evaluator types while moving the stdin/stdout, workspace path, Vitest JSON reporter, score aggregation, and hidden-verifier copy/cleanup plumbing into AgentV-owned adapter glue.

What Changed

• Added SDK Vitest adapter helpers: runVitestWorkspaceGrader(), defineVitestWorkspaceGrader(), and vitestReportToCodeGraderResult().
• Added agentv eval vitest as a code-grader protocol adapter for plain Vitest verifier files.
• Added support for verifier files that live beside the eval instead of inside the prepared workspace by copying them into a temporary workspace-local directory before running Vitest.
• Kept direct workspace file helpers as a lower-level SDK option for tiny one-off checks or custom score shaping.
• Updated examples/features/vitest-workspace-grader/ so the only grader file is graders/welcome-banner.test.ts; the eval calls the built-in adapter directly.
• Updated public docs and SDK README to recommend Vitest verifiers first, then lower-level code graders/helpers when custom behavior is needed.

Verification

• bun --filter @agentv/sdk test
• bun --filter @agentv/sdk typecheck
• bun --filter @agentv/sdk lint
• bun --filter @agentv/sdk build
• bun --filter agentv test
• bun --filter agentv typecheck
• bun --filter agentv lint
• bun --filter agentv build
• bun run build
• bun run validate:examples
• bun apps/cli/src/cli.ts eval examples/features/vitest-workspace-grader/evals/dataset.eval.yaml --target mock_agent passes at 100%; JSONL shows 4 Vitest tests mapped to 4 AgentV assertions.

Tracker

Related: EntityProcess/agentv-beads#11. Beads worktree redirect was repaired separately; notes were pushed for av-bv4.16, av-bv4.17, and av-bv4.19. av-bv4.18 remains the dogfood follow-up for moving the next-evals welcome-banner case to the built-in Vitest path once this AgentV branch is merged/released or otherwise available to that repo.

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