Complete domain migration to platform.glueops.dev in docs and examples

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Completes the domain migration from platform.onglueopshosted.com to platform.glueops.dev initiated in c6aba59. While that commit updated core code files (main.go, crd.yaml, rbac.yaml), documentation and examples still referenced the old domain.

Changes

Documentation

• README.md: Updated GATEKEEPER_GATE_GROUP default value, namespace mode label examples, and Gate CRD apiVersion
• AGENTS.md: Updated policy mode labels, CRD group/version references, and namespace label syntax
• examples/README.md: Updated setup instructions and inline YAML examples

Example Resources

• Gate CRDs: Updated apiVersion in examples/gates/{passing,failing}-gate.yaml and test-gate.yaml
• Test scripts: Updated embedded Gate YAML in examples/{customer,platform}-mode/test-cross-namespace.sh

-apiVersion: platform.onglueopshosted.com/v1alpha1
+apiVersion: platform.glueops.dev/v1alpha1
 kind: Gate

-gatekeeper.platform.onglueopshosted.com/mode: customer|platform
+gatekeeper.platform.glueops.dev/mode: customer|platform

All references to the old domain have been removed from documentation, examples, and test fixtures.

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Pull request overview

This PR completes the migration of the Gate CRD API group and namespace label domain from platform.onglueopshosted.com to platform.glueops.dev across documentation and example/test fixtures, aligning non-code references with the already-updated core manifests and Go defaults.

Changes:

• Updated docs to reference the new Gate CRD group/version and namespace label key domain.
• Updated example Gate YAMLs and embedded Gate definitions in test scripts to use platform.glueops.dev/v1alpha1.
• Added gatekeeper to .gitignore (presumably to ignore the built binary).

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Updates env var default (GATEKEEPER_GATE_GROUP), label key example, and Gate YAML example to the new domain.
AGENTS.md	Updates policy label and Gate CRD group/version references to the new domain.
examples/README.md	Updates setup instructions and inline YAML snippets to the new domain.
examples/platform-mode/test-cross-namespace.sh	Updates embedded Gate YAML apiVersion to the new domain.
examples/customer-mode/test-cross-namespace.sh	Updates embedded Gate YAML apiVersion to the new domain.
examples/gates/passing-gate.yaml	Updates Gate apiVersion to the new domain.
examples/gates/failing-gate.yaml	Updates Gate apiVersion to the new domain.
test-gate.yaml	Updates Gate apiVersion to the new domain.
.gitignore	Adds an ignore entry for gatekeeper (built artifact).

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