Rename package to Diamond

[kcsfelty]

Summary

• rename the project and package from sparql-d1 to Diamond / @gnolith/diamond
• move repository, npm, provenance, security, conformance, examples, and consumer metadata to the Gnolith identity
• update every active install, import, artifact, test-database, and Worker name while retaining only intentional migration history
• prepare the first scoped release as v0.3.0

Migration impact

Existing users should replace sparql-d1 imports with @gnolith/diamond. The old npm package will be retained and deprecated with a migration notice after the scoped package publishes successfully. The prior GitHub URL redirects to gnolith/diamond through GitHub's repository transfer.

Validation

• npm run check (113 tests, coverage, build, examples, Worker, scoped consumer install, licenses, readiness)
• npm run conformance (490/490)
• npm run benchmark:check
• npm run benchmark:storage:check
• npm run release:check -- v0.3.0
• git diff --check