[ADD] OneCAD Draft Odoo integration: Rust odoo_bridge (File>Open via Documents explorer, PollWebControl drain), web/odoo glue trio (save air-gap via openCadStudioSaveFile hook, deep-link via ocs_web_drop_file), CustomEvent web-sys features, BUILD-WASM.md build guide; sandbox-constrained opt-level=0 note in release profile

Cargo.toml

@@ -191,6 +191,9 @@ web-sys = { version = "=0.3.85", features = [
     "DataTransfer",
     "FileList",
     "Event",
+    # OneBSpace (OneCAD Draft): Odoo bridge CustomEvents (web/odoo/ glue).
+    "CustomEvent",
+    "CustomEventInit",
     "ReadableStreamDefaultReader",
     "ReadableStream",
     # The ?file= boot deep link reads location.search and compares the link's
@@ -209,6 +212,8 @@ opt-level = 2
 debug = 1
 
 [profile.release]
+# OneBSpace (OneCAD Draft): disk-constrained sandbox build; rebuild at opt=3 in a roomy env.
+opt-level = 0
 strip = true
 
 [[bench]]