USD/USDA language support for Zed using tree-sitter-usd.

• Syntax highlighting for .usd and .usda
• File association for USD/USDA suffixes
• Basic bracket pairing and indentation query support

1. Open Zed.
2. Open command palette.
3. Run Extensions: Install Dev Extension.
4. Select the cloned local folder for this repository (for example: /path/to/zed-usd).
5. Open fixtures/basic.usda or any .usd/.usda file and verify highlighting.

• extension.toml: extension metadata and grammar pin
• languages/usd/config.toml: language config and file suffix mapping
• languages/usd/highlights.scm: syntax highlight queries
• languages/usd/brackets.scm: bracket pair queries
• languages/usd/indents.scm: indentation queries
• languages/usd/outline.scm: basic symbols in the outline panel
• fixtures/basic.usda: quick manual test fixture

• Highlighting is baseline and may miss some advanced USD constructs.
• .usd can also be binary in some workflows; this extension targets text/ASCII syntax highlighting.
• Rich outline/navigation queries are not included in v1.

This extension uses:

• tree-sitter-usd at commit 4e0875f724d94d0c2ff36f9b8cb0b12f8b20d216
• Upstream grammar license: GPL-3.0-or-later
• Repository license: MIT

See THIRD_PARTY_NOTICES.md and LICENSE.

• Zed editor: https://zed.dev
• Zed extension docs (languages): https://zed.dev/docs/extensions/languages
• Zed extension docs (development): https://zed.dev/docs/extensions/developing-extensions
• tree-sitter-usd grammar (upstream parser used by this extension): https://github.com/ColinKennedy/tree-sitter-usd
• Tree-sitter parser list entry for USD: https://github.com/tree-sitter/tree-sitter/wiki/List-of-parsers
• nvim-treesitter parser registry (USD listed): https://github.com/nvim-treesitter/nvim-treesitter
• OpenUSD project and docs: https://openusd.org