Add streaming cancellable local-agent handles

[Waishnav]

Summary

• normalize provider execution behind streaming, cancellable run handles
• harden process-tree termination, workflow execution policy, event buffering, and provider compatibility
• add lifecycle, cancellation, policy, and adapter regression coverage

Stack

PR 2 of 5. Depends on #78.

Validation

• npm test
• npm run build

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/workflow-provider-handles

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