Regenerate workspace checksums from current source

[Divyansh-db]

What changes are proposed in this pull request?

Regenerate workspace checksums from a fresh full SDK sync after updating the source branch to current master. This replaces the stale-snapshot validation in #86.

The diff against public main contains exactly two files:

• go.work.sum: regenerated workspace checksums, from 61 to 25 lines; the file remains committed.
• features/v1/model.go: generated documentation cleanup for BackfillFeaturesRequest.BackfillRanges.

No public API signatures, executable code, module requirements, release versions, workspace configuration, or ignore rules change. This is a sync-validation draft, with no release preparation or version bump.

How is this tested?

• Ran the full sync into a fresh checkout of public main at 1e4b71bcd4f7a595f6cb8b2aead9f9f7ab184bb3.
• Go tests across all 92 workspace modules passed with the examples build tag, race detector, and readonly module manifests. Tests ran in a separate copy to preserve the exact sync output.
• Sync regression and vendor-consistency tests passed.
• Go formatting and git diff --check passed.