refactor(cli): use provider labels in eval selection

[christso]

Summary

• Rename eval CLI selection internals from target selection to provider-label terminology.
• Pass runEvalCommand raw/normalized provider selection through provider/providers instead of target/targets.
• Update task-bundle selection plumbing and direct callers while leaving generated artifact/result target fields for the U4 artifact slice.

Validation

• bun --filter @agentv/core build
• bun --filter @agentv/sdk build
• bun --filter agentv typecheck
• bun --filter agentv test test/commands/eval/targets.test.ts test/commands/eval/run-command-options.test.ts test/commands/eval/task-bundle.test.ts test/commands/eval/bundle.test.ts test/commands/eval/artifact-writer.test.ts
• bunx biome check apps/cli/src/commands/eval/targets.ts apps/cli/src/commands/eval/run-eval.ts apps/cli/src/commands/eval/commands/run.ts apps/cli/src/commands/eval/commands/bundle.ts apps/cli/src/commands/eval/task-bundle.ts apps/cli/src/commands/eval/artifact-writer.ts apps/cli/src/commands/eval/interactive.ts apps/cli/src/commands/runs/rerun.ts apps/cli/src/commands/prepare/index.ts apps/cli/src/commands/grade/index.ts apps/cli/src/commands/pipeline/run.ts apps/cli/src/commands/pipeline/input.ts apps/cli/test/commands/eval/targets.test.ts apps/cli/test/commands/eval/run-command-options.test.ts apps/cli/test/commands/eval/task-bundle.test.ts apps/cli/test/commands/eval/bundle.test.ts apps/cli/test/commands/eval/artifact-writer.test.ts
• git diff --check

Dogfood

No live provider/grader dogfood was run. This slice renames internal CLI option and selection plumbing only; it does not change eval execution semantics, provider adapters, graders, or generated artifact schemas. Focused CLI selection, bundle, task-bundle, artifact-writer tests plus typecheck cover the changed surface.

Deferred target-era names

• Generated result/artifact fields such as EvaluationResult.target, summary/index target fields, and bundle manifest targets remain for U4.
• SDK/runtime target proxy/client names remain for U5.
• Prepare/pipeline/grade public target-era command surfaces remain for U6; this PR only updates their imports/direct calls needed by the renamed selection helpers.

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