refactor(cli): discover provider catalogs from providers yaml

[christso]

Summary

• rename the CLI provider catalog discovery utility from target-oriented naming to provider-oriented naming
• keep current eval, bundle, interactive, and Dashboard discovery on providers.yaml/providers.yml candidates
• retain targets.yaml reads only behind the existing rerun-only old generated bundle carveout
• add focused coverage for explicit directory discovery of providers.yaml

Validation

• bun --filter @agentv/core build
• bun test apps/cli/test/commands/eval/targets.test.ts apps/cli/test/commands/eval/bundle.test.ts apps/cli/test/commands/runs/rerun.test.ts
• bun test apps/cli/test/eval.integration.test.ts
• bun --filter @agentv/sdk build
• bun --filter agentv typecheck
• bun --filter agentv build
• bunx biome check apps/cli/src/utils/providers.ts apps/cli/src/commands/eval/targets.ts apps/cli/src/commands/eval/commands/bundle.ts apps/cli/src/commands/eval/interactive.ts apps/cli/src/commands/results/eval-runner.ts apps/cli/test/commands/eval/targets.test.ts
• git diff --check

Dogfood

No live provider/grader dogfood was run. This slice is parser/discovery-only and does not change provider execution, grader behavior, or run artifact semantics.

Legacy path

The only retained targets.yaml path is the existing reader-only rerun fallback for old generated run bundles that stored captured provider catalogs as test/targets.yaml or targets_path. Current eval discovery rejects authored targets.yaml with migration guidance.

Bead: av-kfik.53.3

[cloudflare-workers-and-pages]

Deploying agentv with    Cloudflare Pages

Latest commit:	9168557
Status:	✅  Deploy successful!
Preview URL:	https://6123c528.agentv.pages.dev
Branch Preview URL:	https://av-kfik533-providers-yaml.agentv.pages.dev

View logs