Add typed MCP workflow tools and bounded DAG scheduling

[Waishnav]

Summary

• expose typed workflow_run, workflow_status, workflow_wait, workflow_events, and workflow_cancel MCP tools
• add fair global/per-run concurrency, dependency scheduling, retries, and cancellation semantics
• isolate workspace writers in guarded managed worktrees and document the MCP/DAG contracts

Stack

PR 4 of 5. Depends on #80.

Validation

• npm test
• npm run build
• deterministic process-level workflow and MCP integration coverage

🤖 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-mcp-dag

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