Create commercial support documentation

Added a new document outlining commercial support options for Durable Workflow, including coverage details, target audience, engagement types, and contact information.

Author: rmcdaniel

docs/commerical-support.md

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+---
+sidebar_position: 13
+---
+
+# Commercial Support
+
+Durable Workflow is an open-source project and is free to use under the MIT license.
+
+Commercial support and consultancy are **entirely optional** and are offered for teams that want additional assurance, maintainer-level guidance, or a formal escalation path when using Durable Workflow in production systems.
+
+Using Durable Workflow does **not** require a commercial agreement, and all functionality remains fully open source regardless of whether commercial support is used.
+
+---
+
+## What Commercial Support Covers
+
+Support engagements are led by the project maintainer and typically include:
+
+- **Workflow architecture & design reviews**  
+  Guidance on modeling workflows correctly, including activity boundaries, signals, inbox/outbox usage, and long-running execution patterns.
+
+- **Determinism & replay safety guidance**  
+  Help identifying and avoiding non-deterministic behavior, replay issues, and subtle correctness problems that can surface over time.
+
+- **Upgrade & versioning strategy**  
+  Assistance with safe upgrades, workflow versioning, and determining when patterns like `continue-as-new` are required.
+
+- **Debugging complex workflow behavior**  
+  Support with diagnosing stuck workflows, unexpected loops, signal handling issues, and other hard-to-reason-about runtime behavior.
+
+- **Backports & patches**  
+  Access to fixes and backports for supported versions to help avoid maintaining private forks.
+
+- **Custom integrations (by arrangement)**  
+  Help integrating Durable Workflow with existing systems such as chat platforms, approval systems, internal APIs, or observability tooling.
+
+---
+
+## Who This Is For
+
+Commercial support is typically a good fit if you are:
+
+- Running Durable Workflow in **production**
+- Building **long-running or human-in-the-loop workflows**
+- Operating in an environment where **correctness and upgrade safety matter**
+- Looking for **maintainer-level expertise** rather than generic consulting
+- Wanting to avoid forks and long-term maintenance risk
+
+---
+
+## Engagement Types
+
+Engagements may take different forms depending on your needs, including:
+
+- Advisory or design review sessions  
+- Ongoing commercial support retainers  
+- Short, focused project-based engagements  
+
+Details are discussed case-by-case to ensure the engagement is a good fit.
+
+---
+
+## Contact
+
+To discuss commercial support or consultancy, please contact:
+
+**support@durable-workflow.com**
+
+We’re happy to start with a short introductory conversation to understand your use case and determine next steps.