chore: restore product scaffold to rollback baseline

.gitignore

@@ -70,16 +70,10 @@ temp/
 # Upstream documentation snapshots (kept as reference, not project source)
 chanora-docs-repo-format-*.zip
 
-# Local vendored-crate experiments. Product dependencies must use
-# crates.io/git dependencies or explicitly committed source with
-# license provenance.
-/third_party/
-
 # Cargo
 **/Cargo.lock.bak
 
 # Flutter / Dart generated (but keep pubspec.lock for the PoC apps)
-.flutter-home/
 **/.dart_tool/
 **/.flutter-plugins
 **/.flutter-plugins-dependencies