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/sync/blobs.rs

@@ -223,7 +223,7 @@ pub(crate) fn scratch(tag: &str) -> BlobStore {
     use std::sync::atomic::{AtomicU32, Ordering};
     static SEQ: AtomicU32 = AtomicU32::new(0);
     let n = SEQ.fetch_add(1, Ordering::Relaxed);
-    let dir = std::env::temp_dir().join(format!("ts-blobs-{}-{n}-{tag}", std::process::id()));
+    let dir = std::env::temp_dir().join(format!("inkwell-blobs-{}-{n}-{tag}", std::process::id()));
     let _ = fs::remove_dir_all(&dir);
     BlobStore::new(dir).expect("scratch blob store")
 }
@@ -326,7 +326,7 @@ mod tests {
     #[test]
     fn serving_refuses_a_path_that_isnt_a_hash() {
         // Delegated to `path`, so the traversal guard is the same one `store` uses.
-        publish_root(std::env::temp_dir().join("ts-blobs-serve-guard"));
+        publish_root(std::env::temp_dir().join("inkwell-blobs-serve-guard"));
         let (status, _, body) = serve("/../../etc/passwd", None);
         assert_eq!(status, 404);
         assert!(body.is_empty());