Add K8s v1beta1 migration guide (#719)

* Add K8s v1beta1 migration guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Add stepwise upgrade guidance and release note links

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Address Copilot review feedback

- Add missing path arg to grep examples
- Use Helm CRD chart for CRD upgrade step (matches deploy docs)
- Note that some versions require manifest changes before re-applying

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Add Helm and kubectl tabs for CRD upgrade step

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Inline both CRD upgrade methods in numbered list

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Note removed types in int32 table for cross-reference clarity

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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Co-authored-by: Dan Barr <6922515+danbarr@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people