docs(examples): add provider-owned batching example

[christso]

Summary

This adds a runnable replacement example for throughput-oriented CLI tools after runner-level Batch CLI deprecation: AgentV still invokes the provider once per eval case, while the CLI adapter queues those requests and flushes them as one provider-owned batch.

The example keeps batching out of eval runner config. The eval selects a normal provider label, the provider catalog uses a normal CLI provider without batch_requests or provider_batching, and the adapter maps each queued request back to its own output/error identity using the AgentV {EVAL_ID}.

Related: av-kfik.56

Validation

• bun install
• bun run build passed after installing worktree dependencies; build emitted existing Rollup/Zod declaration warnings.
• bun apps/cli/src/cli.ts validate examples/features/provider-owned-batching/evals/suite.yaml
• bun examples/features/provider-owned-batching/scripts/smoke-provider-owned-batching.ts
• PROVIDER_OWNED_BATCH_STATE_DIR=/tmp/agentv-provider-owned-batching-eval-state bun apps/cli/src/cli.ts eval examples/features/provider-owned-batching/evals/suite.yaml --providers examples/features/provider-owned-batching/providers.yaml
  • Result: 3/3 pass.
  • Provider-owned batch log: one timeout flush with request_ids ticket-block, ticket-clear, and ticket-review.
• bunx biome check examples/README.md examples/features/provider-owned-batching
• git diff --check
• bun run validate:examples still fails on unrelated existing examples/showcase/multi-model-benchmark/evals/benchmark.eval.yaml because evaluate_options.repeat still uses the removed object shape.

This is example-only: no eval/provider execution behavior changed, so live provider/grader dogfood for core behavior is not applicable.

Post-Deploy Monitoring & Validation

No additional operational monitoring required. This PR adds a local deterministic example and does not change runtime service behavior.

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