Revert "Merge branch 'fix/httpvfs-chunked-length'"

This reverts commit d4f106f488, reversing
changes made to c5ef1f58ff.

docs/data-pipeline.md

@@ -199,7 +199,7 @@ exists.
 ## Verifying a rebuild
 
 The assembler verifies itself: each database's row count must match the
-figure in the table above, and each `.sqlite30` must be at least 90% of its usual
+figure in the table above, and each `.sqlite3` must be at least 90% of its usual
 size, or the build fails rather than publishing. That guard is the reason a
 truncated dataset cannot reach the site with a green pipeline.
 
@@ -213,8 +213,8 @@ go -C assembler run ./cmd/assemble db   # rebuild
 go -C assembler run ./cmd/assemble verify /tmp/before .build/public/db
 ```
 
-Each side is a directory of `<id>.sqlite30`; a gzipped database from before the
-switch to range requests is still expanded to a temporary file automatically. It exits non-zero on any mismatch,
+Each side is a directory of `<id>.sqlite3`; a database under an older name, or
+a gzipped one, is still opened automatically. It exits non-zero on any mismatch,
 names the first differing rows and columns, and fails rather than skipping when a
 dataset is absent from either side — silently comparing one of two datasets is
 how a gate passes without proving anything.