feat(client): add app-hosted connector worker

[buremba]

Summary

• add @lobu/client/node with Lobu, defineConnector, feed, action, and app-hosted connector serving
• register metadata-only connector definitions without uploading source or compiled code
• dogfood existing /api/workers/* polling, stream, complete, and complete-action endpoints for local feed/action functions
• let SDK workers narrow polls by connector key and skip compiled-code resolution for app-hosted connectors

Validation

• bun test packages/client/src
• cd packages/client && bun run typecheck && bun run build
• cd packages/pgvector-embedded && bun run build && cd ../server && bun run typecheck
• bun run typecheck:packages
• Claude Code review pass; followed up on retry/loop, poll filtering, and schema validation concerns

Notes

• Stacked on feat(client): add TypeScript SDK #1015.
• Public API is intentionally small: register schema, serve functions. No source upload or bundling.

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: abb965f7-b535-4d9a-b4b9-752436c97c83

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/app-hosted-connectors

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[buremba]

Closing: the app-hosted poll-loop runtime is being dropped in favor of the existing connector execution path (connector-sdk + connector-worker).

The valuable part — a defineConnector authoring API — will be reintroduced as sugar over ConnectorRuntime (reusing SyncContext/SyncResult/ConnectorDefinition), lowering to a class the existing worker's child-runner runs unchanged. This PR instead declared a parallel HostedConnector contract + its own poll loop, which duplicates the connector type system and reinvents the durable-run queue. #1015 (consumption SDK) is unaffected and stays open.