DRY pass #2, batch 8: the Rust and ffi docs (#5372)

sync/mod.rs listed 5 of its 9 modules; migrate's doc sat above the v9 SQL;
client.rs had items after its test module; the ffi's sync_now doc had fused
into client_update's; complete_reminder (ffi and EditorAction) still said
recurrence advancement was to come, though the core does it; NoteQuery.view
listed views the core never matched and claimed it validated. Test scratch
dirs drop the old ts-/iw- prefixes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

core/src/local/schema.rs

@@ -1,6 +1,6 @@
 //! Local SQLite schema + migrations. The schema mirrors the note/label model so an
 //! offline note can later sync 1:1 with the server. Each syncable row carries local
-//! `sync_revision` + `dirty` bookkeeping (consumed by the sync engine in M10.7);
+//! `sync_revision` + `dirty` bookkeeping (consumed by `sync::push` and `sync::pull`);
 //! `#tags` are NOT stored as such (derived at query time into labels), matching
 //! docs/sync.md.
 //!
@@ -250,7 +250,6 @@ fn migrate_v8(conn: &Connection) -> rusqlite::Result<()> {
     Ok(())
 }
 
-/// Bring the database up to the latest schema. Idempotent.
 // v9 (M315): `notes.color` is gone. A card is one neutral surface now and colour lives
 // only on a tag, so the column was written by a picker nothing read and read by nothing
 // at all. `labels.color` is untouched — that is the colour that survived.
@@ -356,6 +355,7 @@ const STEPS: &[Step] = &[
     Step::Sql(SCHEMA_V13),
 ];
 
+/// Bring the database up to the latest schema. Idempotent.
 pub fn migrate(conn: &Connection) -> rusqlite::Result<()> {
     conn.execute_batch("PRAGMA foreign_keys = ON;")?;
     let version: i64 = conn.query_row("PRAGMA user_version", [], |r| r.get(0))?;