Add CI pipeline documentation and enhance syncback architecture

- Introduced a new CI pipeline documentation file outlining steps for auto-fixing formatting, running linters, building, and testing.
- Documented the Rojo syncback architecture, detailing improvements to prevent duplicate file creation and format mismatches.
- Updated syncback logic to ensure existing instances are updated instead of creating duplicates, enhancing project file management.
- Added tests for encoding instances and handling nested children to improve reliability in syncback operations.

rojo-test/serve-tests/syncback_scripts_only/default.project.json5

@@ -0,0 +1,11 @@
+{
+  "name": "syncback_scripts_only",
+  "syncScriptsOnly": true,
+  "tree": {
+    "$className": "DataModel",
+    "ServerScriptService": {
+      "$className": "ServerScriptService",
+      "$path": "src"
+    }
+  }
+}

rojo-test/serve-tests/syncback_scripts_only/src/NonScriptModel.model.json5

@@ -0,0 +1,4 @@
+{
+  "className": "Configuration",
+  "properties": {}
+}

rojo-test/serve-tests/syncback_scripts_only/src/ScriptWithChildren/Helper.luau

@@ -0,0 +1,2 @@
+-- Helper module
+return {}

rojo-test/serve-tests/syncback_scripts_only/src/ScriptWithChildren/init.server.luau

@@ -0,0 +1,2 @@
+-- Server script with children
+print("ScriptWithChildren started")

rojo-test/serve-tests/syncback_scripts_only/src/StandaloneModule.luau

@@ -0,0 +1,2 @@
+-- Standalone module script
+return { standalone = true }