MAX/MIN/COALESCE over a DATETIME TEXT column drop the declared type
(sqlite3_column_decltype returns "" for aggregates), so Next delivered a
raw string and a Scan into *time.Time failed with "unsupported Scan,
storing driver.Value type string into type *time.Time".

The column-metadata route the reporter suggested does not help: on master
sqlite3_column_origin_name already resolves direct columns (ColumnInfo,
!113) but returns "" through MAX/MIN/COALESCE, so it cannot recover the
source type. This does the runtime best-effort parse instead: an
empty-decltype TEXT column under _texttotime is parsed via parseTime;
success yields time.Time, failure falls back to the original string, so
no Scan that worked before can newly fail.

Gated on _texttotime so non-opt-in callers are unaffected.
ColumnTypeScanType is left reporting string for empty decltype, since it
is called before any row and cannot know an aggregate is date-shaped;
Next ...

Addresses !133 review: reword the rows.go comment to cover every empty-decltype
TEXT case (aggregates/expressions, subqueries, typeless real columns) rather
than only MAX/MIN/COALESCE, document the *string RFC3339Nano reformat
consequence on the _texttotime DSN doc, and add the v1.54.0 CHANGELOG entry.

sqlite: _texttotime best-effort parse for empty-decltype TEXT columns (#248)

See merge request !133

Re-vendor lib/ and vec/ from libsqlite3 v1.14.2 and libsqlite_vec v0.3.1
(SQLite 3.53.3) and bump the pinned modernc.org/libc to v1.74.1, the version
the transpile was generated against. Updates doc.go, CLAUDE.md, and the pending
v1.54.0 CHANGELOG section. make vendor build_all_targets passes; local test
suite (root incl. TestVec, pcache, vfs) is green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>