fix(worker): gate workflow diagnostic logs

[zebbern]

Summary

• gate routine workflow runner and runWorkflow activity console.log diagnostics behind SENTRIS_DEBUG_WORKFLOW=1
• keep warning/error logging paths unchanged
• add a regression test that executeWorkflow does not write workflow diagnostics by default

Verification

• git diff --check
• bun test worker/src/temporal/tests/workflow-runner.test.ts
• bun test worker/src/temporal/activities/tests/run-workflow.activity.test.ts
• bun test worker/src/temporal
• bun run typecheck
• bun run lint
• bun run test

[Copilot]

Pull request overview

This PR reduces noise from the worker’s workflow execution path by gating routine console.log-based diagnostics behind SENTRIS_DEBUG_WORKFLOW=1, while leaving warning/error logging behavior unchanged. It also adds a regression test to ensure executeWorkflow() is quiet by default.

Changes:

• Added workflowDiagnosticLog() helper that conditionally emits diagnostics when SENTRIS_DEBUG_WORKFLOW === '1'.
• Replaced routine console.log diagnostics in executeWorkflow() and runWorkflowActivity() with workflowDiagnosticLog().
• Added a regression test asserting executeWorkflow() does not write to console.log by default.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
worker/src/temporal/workflow-runner.ts	Routes workflow-runner diagnostic logs through the new gated diagnostic logger.
worker/src/temporal/workflow-diagnostics.ts	Introduces the env-gated diagnostic logging helper.
worker/src/temporal/activities/run-workflow.activity.ts	Gates activity start/end diagnostic logs behind SENTRIS_DEBUG_WORKFLOW.
worker/src/temporal/tests/workflow-runner.test.ts	Adds a regression test ensuring diagnostics don’t hit console.log by default.

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