v0.2: Pico-8 Lua dialect grammar and language

Reorganize into grammars/<name>/ subdirs ( Zed's [grammars.*] supports
a `path` field, so both grammars ship from this repo without a sibling-
repo split ). Vendor tree-sitter-lua as the fork base for tree-sitter-
pico8-lua; upstream MIT license preserved at grammars/pico-8-lua/
UPSTREAM-LICENSE.md.

Dialect features added: != as ~= alias, \ integer divide, ^^ binary xor,
>>> / <<> / >>< shifts and rotates, compound-assignment statements,
memory peek prefixes @ % $ (% coexists with binary modulo), single-line
`if (cond) stmt [else stmt]` and `while (cond) stmt`, statement-level
print shorthand ?, and `#include path` directives. Identifier rule no
longer accepts ! ? @ $ ( upstream did ).

Pico-8 Lua language ( languages/pico-8-lua/, suffix .p8lua ) ships
highlights with the full ~110 PICO-8 builtins as @function.builtin.
The cart injection now hands __lua__ bodies to pico-8-lua, so .p8 carts
and bare .p8lua files share the dialect-aware grammar. Examples updated
to exercise the dialect end-to-end.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,15 +1,8 @@
 {
-  "name": "tree-sitter-p8-cart",
-  "version": "0.0.1",
-  "description": "tree-sitter grammar for the PICO-8 .p8 cartridge text format",
-  "main": "bindings/node",
-  "types": "bindings/node",
-  "keywords": [
-    "tree-sitter",
-    "parser",
-    "pico-8",
-    "pico8"
-  ],
+  "name": "zed-p8-workspace",
+  "version": "0.0.2",
+  "private": true,
+  "description": "Workspace root for the zed-p8 extension; hosts tree-sitter-cli for the grammars under grammars/",
   "license": "0BSD",
   "devDependencies": {
     "tree-sitter-cli": "^0.24.7"