fix(supervisor): merge child bound config before invoke

[lsharir]

Summary

• Ensure child agent invocations via the supervisor inherit bound config (tags/metadata) consistently by merging configs before invoking the child and relying on the merged config for propagation.

Motivation

• Handoffs from the supervisor to child agents did not reliably inherit child-bound tags/metadata. This aligns the supervisor path with existing mergeConfigs(boundConfig, invocationConfig) usage across the repo.

Changes

• Update libs/langgraph-supervisor/src/supervisor.ts:
  • Use mergeConfigs(agent?.config, config) before agent.invoke(...).
• Add test libs/langgraph-supervisor/src/tests/supervisor_tags.propagation.test.ts:
  • Assert that a child node’s chain event (scoped by metadata.langgraph_node === "childAgent") includes the child-bound tag.

Testing

• Lint/format/build run locally.
• All tests pass:
  • yarn workspace @langchain/langgraph-supervisor test (7/7 passing).

Backwards Compatibility

• No public API changes.
• Behavior now matches the repo’s established pattern for config propagation.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3a6380e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@langchain/langgraph-supervisor	Patch

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