refactor(sdk): hard-rename provider proxy client

[christso]

Summary

Script graders now use provider-native proxy naming end to end. SDK consumers import createProviderClient/ProviderClient, script evaluator config enables proxy access with provider, proxy requests override with provider, /info reports providerLabel and availableProviderLabels, and AgentV injects AGENTV_PROVIDER_PROXY_URL/AGENTV_PROVIDER_PROXY_TOKEN.

This intentionally removes the target-era SDK/proxy surface rather than keeping aliases. There is no retained target-named env or wire fallback in this slice; run artifact metadata such as target_proxy remains untouched because av-kfik.53.4 owns artifact-field migration.

Exported Surface Impact

• Removed from @agentv/sdk: createTargetClient, TargetClient, TargetInfo, TargetInvokeRequest, TargetInvokeResponse, TargetNotAvailableError, and TargetInvocationError.
• Added replacements in @agentv/sdk: createProviderClient, ProviderClient, ProviderInfo, ProviderInvokeRequest, ProviderInvokeResponse, ProviderNotAvailableError, and ProviderInvocationError.
• Renamed core runtime proxy exports from TargetProxy*/createTargetProxy to ProviderProxy*/createProviderProxy.
• Script evaluator provider proxy config is now provider: true or provider: { max_calls }; script evaluator target is rejected with migration guidance.

Validation

• bun test packages/sdk/test/provider-client.test.ts
• bun test packages/core/test/runtime/provider-proxy.test.ts packages/core/test/evaluation/token-usage.test.ts packages/core/test/evaluation/loaders/grader-parser.test.ts
• bun run validate:eval-schema
• bun --filter @agentv/core build
• bun --filter @agentv/sdk build
• bun --filter @agentv/core typecheck
• bun --filter @agentv/sdk typecheck
• cd examples/features/sdk-python && uv run pytest
• bunx biome check <touched files>
• git diff --check
• Removed-name scan for SDK/proxy target-era names returned no matches outside excluded historical plan/ADR/archive paths.

No live provider dogfood was run: this slice renames the local script-grader provider proxy surface and does not alter provider invocation or grading semantics beyond field/env names. The focused SDK client, runtime proxy, parser/schema, and Python helper tests exercise the changed contract.

Post-Deploy Monitoring & Validation

No additional operational monitoring required. This is a published API/config rename in local SDK/runtime proxy code with no hosted service, background job, dashboard, or production runtime path to monitor after merge; GitHub Actions and package consumers are the validation gates.

Healthy signals after merge:

• GitHub Actions pass on the PR merge commit.
• Docs/examples reference createProviderClient, provider, providerLabel, availableProviderLabels, and AGENTV_PROVIDER_PROXY_*.
• No new references to removed SDK/proxy target-era names appear in CI or follow-up branches.

Failure signals and mitigation:

• CI import/type failures referencing removed target client/proxy names. Mitigation: migrate the missed callsite to provider naming in this PR before merge.
• Example/schema failures using script evaluator target. Mitigation: update to provider unless the path is explicitly owned by a separate non-goal bead.

Validation window and owner: PR review and GitHub Actions before merge; owner Christopher Tso.

Related

Related: av-kfik.53.5

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