docs: baked a lot of API docs

docs/API/sync.md

@@ -8,4 +8,47 @@ references:
 
 The Sync API provides functions for interacting with the sync engine when the client runs in Sync mode.
 
-${spacelua.renderApiDocumentation("sync")}
+<!--#lua spacelua.renderApiDocumentation("sync") -->
+## sync.hasInitialSyncCompleted
+
+`sync.hasInitialSyncCompleted()`
+
+Checks whether the initial client synchronization has completed.
+
+**Returns:**
+
+- `boolean` — Whether initial sync is complete.
+
+## sync.performFileSync
+
+`sync.performFileSync(path)`
+
+Prioritizes a file for immediate synchronization and waits for completion.
+
+**Parameters:**
+
+- `path` (`string`) — Space-relative file path.
+
+**Example:**
+
+```lua
+sync.performFileSync("notes/important.md")
+```
+
+## sync.performSpaceSync
+
+`sync.performSpaceSync()`
+
+Starts an immediate full-space synchronization and waits for completion.
+
+**Returns:**
+
+- `number` — Number of sync operations, or zero without an active worker.
+
+**Example:**
+
+```lua
+local changes = sync.performSpaceSync()
+```
+<!--/lua-->
+