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Migration from Schema-Lens to SolrGuard

SolrGuard is the new product identity for Schema-Lens.

What changed

Product name: Schema-Lens -> SolrGuard
Primary CLI command: schema-lens -> solrguard
API service identity string: schema-lens-api -> solrguard-api
CI/report headings updated to SolrGuard branding

Old vs new commands

Old	New
`schema-lens run ...`	`solrguard run ...`
`schema-lens gate ...`	`solrguard gate ...`
`schema-lens api serve ...`	`solrguard api serve ...`
`schema-lens compatibility ...`	`solrguard compatibility ...`

Backward compatibility guarantees (current release)

schema-lens CLI alias remains supported.
Python import path remains schema_lens.
Changeset key schema_lens_version remains supported (preferred key: solrguard_version).
Legacy API auth header x-schema-lens-token remains accepted.
Legacy Helm chart path helm/schema-lens remains available.
Legacy Prometheus aliases schema_lens_* remain emitted.

Known changes

Docs/examples now use solrguard by default.
Docker and Helm metadata use SolrGuard branding.

Deprecation path

schema-lens command alias is planned for deprecation in a future major release.
schema_lens import path remains stable until a dedicated major migration plan is published.
See explicit timelines in docs/deprecation-schedule.md.

Recommended migration timeline

Immediate: switch automation to solrguard command.
Near-term: update internal docs and runbooks to SolrGuard naming.
Later: monitor release notes for alias deprecation milestones.