fix(workflow-executor): use last step from history (orchestrator as source of truth)

[Scra3]

Summary

• Replace workflowHistory.find(s => !s.done && !s.cancelled && !s.context?.error) with workflowHistory.at(-1) — the orchestrator is the source of truth for which step to execute next
• Add if (pending.done) return null to handle completed runs gracefully (last step done = nothing to execute)
• Remove tests that asserted the old filtering logic; update remaining tests to reflect the new contract

Test plan

• yarn workspace @forestadmin/workflow-executor test passes
• Empty history → null
• Last step done: true → null (run complete)
• Last step done: false → step is executed regardless of cancelled/error flags

🤖 Generated with Claude Code

Note

Fix pending step selection to use last workflowHistory entry as source of truth

• toAvailableStepExecution in run-to-available-step-mapper.ts now selects the last entry in workflowHistory as the pending step, returning null if that step is done.
• ForestServerWorkflowPort.toMalformedInfo in forest-server-workflow-port.ts applies the same logic for stepId/stepIndex resolution.
• Behavioral Change: cancelled steps and steps with context.error are no longer skipped during pending step selection — only the position (last) in history matters now.

^{Macroscope summarized efc8559.}

[qltysh]

Coverage Impact

This PR will not change total coverage.

Modified Files with Diff Coverage (2)

Rating	File	% Diff	Uncovered Line #s
	.../workflow-executor/src/adapters/forest-server-workflow-port.ts	100.0%
	...workflow-executor/src/adapters/run-to-available-step-mapper.ts	100.0%
	Total	100.0%

🚦 See full report on Qlty Cloud »

🛟 Help

• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

• Total Coverage: Coverage for the whole repository, calculated as the sum of all File Coverage. Learn more.

• File Coverage: Covered Lines divided by Covered Lines plus Missed Lines. (Excludes non-executable lines including blank lines and comments.)

  • Indirect Changes: Changes to File Coverage for files that were not modified in this PR. Learn more.