add generics

README.md

@@ -10,7 +10,9 @@ The public named-node and field contract is documented in
 
 ## Development
 
-Tree-sitter 0.27 and Node.js are required.
+Tree-sitter 0.27 is required. `tree-sitter generate` evaluates `grammar.js`
+with Node.js by default; without Node.js, pass `--js-runtime native` to use the
+CLI's bundled QuickJS runtime.
 
 ```sh
 npm install
@@ -28,9 +30,8 @@ script: the adjacency-only `=-` and `!=` lexer errors, and recovery after a
 repeated result operator. These need lexical or recovery handling rather than
 a looser grammar rule.
 
-The future-reserved word `context` is not yet emitted as a Tree-sitter keyword
-because it has no grammar production. It should move into lexical handling with
-the two adjacency checks above.
+The future-reserved word `context` is a `reserved_word` token with no grammar
+production, so it is rejected wherever an identifier is expected.
 
 Generated parser sources under `src/` are committed so consumers do not need
 Node.js or the Tree-sitter CLI.