feat(workflow-executor): implement WorkflowPort adapter using forestadmin-client

[matthv]

Summary

• Implements ForestServerWorkflowPort class that wraps ServerUtils.query from @forestadmin/forestadmin-client to communicate with the Forest Admin server via HTTP
• Exports ServerUtils from forestadmin-client for reuse
• Renames completeStepExecution → updateStepExecution on the WorkflowPort interface
• Route paths are placeholders (TODO in code) pending team alignment

Test plan

• Unit tests with mocked ServerUtils.query for all 4 methods
• Error propagation test
• Lint + build pass

fixes PRD-233

🤖 Generated with Claude Code

Note

Implement ForestServerWorkflowPort adapter in workflow-executor using forestadmin-client

• Adds ForestServerWorkflowPort, a new WorkflowPort implementation that communicates with the Forest server over HTTP using ServerUtils.query from @forestadmin/forestadmin-client.
• Implements four methods: getPendingStepExecutions, updateStepExecution, getCollectionRef, and getMcpServerConfigs, each mapped to a specific /liana/v1/... route.
• Renames completeStepExecution to updateStepExecution in the WorkflowPort interface.
• Exposes ForestServerWorkflowPort as a public export from workflow-executor and adds ServerUtils to the forestadmin-client public API.
• Behavioral Change: the WorkflowPort interface method rename is a breaking change for any existing implementations of completeStepExecution.

^{Macroscope summarized a0dd5a9.}

[linear]

PRD-233 Implémenter WorkflowPort (calls vers le serveur Forest Admin)

[qltysh]

Coverage Impact

This PR will not change total coverage.

Modified Files with Diff Coverage (3)

Rating	File	% Diff	Uncovered Line #s
	packages/forestadmin-client/src/index.ts	100.0%
	packages/workflow-executor/src/index.ts	100.0%
	.../workflow-executor/src/adapters/forest-server-workflow-port.ts	100.0%
	Total	100.0%

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[Scra3]

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