fix: harden UCE runtime and starter

site/doc/pages/sqlite_connect.txt

@@ -0,0 +1,28 @@
+:sig
+SQLite* sqlite_connect(String path)
+
+:params
+path : filesystem path to the SQLite database file
+return value : pointer to a SQLite connection struct
+
+:see
+>sqlite
+sqlite_query
+sqlite_error
+sqlite_disconnect
+
+:content
+Opens an SQLite database file and returns a connection handle.
+
+UCE opens SQLite with serialized/full-mutex connection mode, sets a busy timeout, enables foreign keys, and applies WAL-oriented defaults:
+
+```sql
+PRAGMA busy_timeout = 5000;
+PRAGMA foreign_keys = ON;
+PRAGMA journal_mode = WAL;
+PRAGMA synchronous = NORMAL;
+```
+
+SQLite itself handles file locking and one-writer/many-reader concurrency. UCE does not add a separate app-level database lock.
+
+Connections are registered for request cleanup, but explicit `sqlite_disconnect()` is still preferred when you are done with the handle.