feat(grader): support agent-rubric compatibility

[christso]

Summary

• adds Promptfoo-compatible agent-rubric as a supported AgentV assertion mapped onto the existing structured LLM grader path
• keeps public authoring on provider/default grader selection and does not add top-level graders:
• enforces structured agent-grader verdict JSON with file-first verdict handling and fallback validation
• updates docs, eval-writer skill guidance, SDK assertion typing, parser/schema/validator coverage

Validation

• bun test packages/core/test/evaluation/loaders/grader-parser.test.ts packages/core/test/evaluation/validation/eval-file-schema.test.ts packages/core/test/evaluation/validation/eval-validator.test.ts packages/core/test/evaluation/graders.test.ts
• bun --filter @agentv/core typecheck
• bun --filter @agentv/sdk typecheck
• bun --filter @agentv/core build
• bun --filter @agentv/sdk build
• bun --filter agentv build
• bun --filter @agentv/core lint
• git diff --check
• env LOCAL_OPENAI_PROXY_BASE_URL=http://127.0.0.1:10531/v1 LOCAL_OPENAI_PROXY_API_KEY=dummy LOCAL_OPENAI_PROXY_MODEL=gpt-5.4-mini bun apps/cli/src/cli.ts validate .agentv/results/av-8pjk-agent-rubric-dogfood/source/evals/agent-rubric.eval.yaml

Live dogfood

• endpoint: http://127.0.0.1:10531/v1
• model: gpt-5.4-mini
• command: env LOCAL_OPENAI_PROXY_BASE_URL=http://127.0.0.1:10531/v1 LOCAL_OPENAI_PROXY_API_KEY=dummy LOCAL_OPENAI_PROXY_MODEL=gpt-5.4-mini bun /home/entity/projects/EntityProcess/agentv__worktrees/av-8pjk-agent-rubric-finish/apps/cli/src/cli.ts eval run evals/agent-rubric.eval.yaml --workers 1
• final run: 2026-07-07T06-09-22-804Z, 1/1 passed, agent-rubric:agent-rubric score 1
• grading artifact records delegate mode with grader_target: codex-agent-grader and verdict_source: file
• private evidence: EntityProcess/agentv-private branch evidence/av-8pjk-agent-rubric commit 97f0463, path dogfood/av-8pjk-agent-rubric/

Notes

• Manual review was performed after rebasing onto fix(config): route providers through unified config #1715. Formal subagent code-review tooling was not used because the available subagent tool instructions only allow spawning when delegation/parallel agents are explicitly requested.

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