chore: Use project-neutral terminology

[timflannagan]

Description

Replace edition-specific and branded terminology in extension examples,
templates, and test fixtures with project-neutral language. Use "embedding
application" where "downstream" was shorthand rather than a literal dependency
relationship, and remove the vendor attribution from the UI footer. Clarify
that MCP registry compatibility routes are unauthenticated by default, while
existing authorization hooks can constrain anonymous reads.

Change Type

/kind cleanup

Changelog

NONE

Additional Notes

Contextual uses of Enterprise and literal dependency-direction uses of
"downstream" remain unchanged. Persisted agentregistry.solo.io labels and
annotations also remain unchanged so existing resources retain ownership and
compatibility across upgrades.

Focused Go package tests and ESLint for the changed footer passed. Broad
make test and make lint targets were not run.

[Copilot]

Pull request overview

This PR standardizes project-neutral terminology across the repo’s docs, templates, examples, and test fixtures, and removes the vendor attribution from the UI footer while preserving existing footer functionality.

Changes:

• Removed vendor attribution text/link from the UI footer.
• Updated docs/templates/test fixtures to use project-neutral wording (e.g., “extension”, “self-hosted”, “reference implementation”).
• Adjusted various narrative comments and examples to align with the new terminology.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
ui/components/footer.tsx	Removes vendor attribution from the footer while keeping the rest of the footer intact.
pkg/registry/v1alpha1store/rebase_fuzz_test.go	Updates terminology in fuzz-test commentary about authz seams.
pkg/cli/root_test.go	Updates test fixtures that refer to “enterprise” to “extension”.
pkg/cli/README.md	Updates downstream CLI customization examples to use project-neutral placeholders.
pkg/api/v1alpha1/scheme_test.go	Renames a fixture resource name to project-neutral wording.
internal/registry/registry_app_test.go	Renames a fixture reference to project-neutral wording.
internal/cli/skill/templates/hello-world/references/example_guide.md.tmpl	Replaces “Enterprise systems” phrasing in an example guide.
internal/cli/frameworks/builtin/adk-python/templates/pyproject.toml.tmpl	Removes vendor-specific attribution in template comments.
internal/cli/frameworks/builtin/adk-python/templates/{{.Name}}/agent.py.tmpl	Rewords template comments to remove vendor-specific attribution.
internal/cli/common/gitutil/gitutil.go	Updates wording around supported Git hosts for neutral terminology.
internal/cli/common/gitutil/gitutil_test.go	Updates test case naming for neutral terminology.
docs/mcp-registry-compatibility.md	Updates client configuration guidance to neutral terminology.
docs/governance/cncf/technical-review.md	Rewords governance documentation to avoid “enterprise client” phrasing.

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