docs: complete SQL reference, enrich Functions drafts, rename OSS to Embedded (#4732)

## Summary

- Complete the SQL reference: `ATTACH DATABASE`, the `CHANGES` clause,
and
`dedupe()`/`duplicate_pairs()` (verified against current sophon source;
these were recently renamed from
`vector_dedup`/`vector_duplicate_pairs`).
  Fix the blob-column default-projection claim and add the previously
  undocumented `blob_descriptor()`.
- Enrich the gated Functions draft (still `.mintignore`'d, pre-release):
  chained Functions over blob outputs, GPU-produced blobs, Secrets,
  multi-input/output binding, `code=[module]` packaging.
- Upgrade the materialized-view and computed-column auto-refresh drafts
with
  precise, verified catch-up semantics, and add the missing `ALTER
  MATERIALIZED VIEW` / `CREATE ... WITH(...)` sections (also gated — the
  automatic-refresh scheduler is still dev/staging-only).
- Thread one running example (video frames → GPU extract/caption → dedup
→
auto-refreshing materialized view) through Functions, materialized
views,
and the LeRobotDataset integration guide instead of a separate tutorial.
- Rename "LanceDB OSS"/"OSS" to "LanceDB Embedded"/"Embedded" throughout
  (52 files); activate the existing availability-comparison mechanism on
  `basics/offerings.mdx` for a full feature-by-feature comparison table.

docs/web/tutorials/feature-engineering/feature-engineering-101.mdx

@@ -5,7 +5,6 @@ description: "Add derived feature columns to an existing table."
 ---
 
 Adds new derived features to a table, the pattern documented under
-[data evolution](/feature-engineering/data-evolution) and
 [computed columns](/feature-engineering/add-computed-column).
 
 <Note>

docs/web/tutorials/feature-engineering/materialized-views.mdx

@@ -6,7 +6,7 @@ description: "Persist query results as physical tables and keep them current."
 
 Creates [materialized views](/management/materialized-view): query results
 persisted as physical tables, brought up to date by a
-[refresh](/feature-engineering/materialized-views).
+[refresh](/feature-engineering/refresh-materialized-view).
 
 <Note>
 This example is a runnable notebook in the