feat(tree-sitter): add tree-sitter-n6 grammar

Total line model (no external scanner / look-around) — every line is
comment/header/edge/body/text/blank, exposing type + edge_op (7-edge
alphabet). Verified 0 ERROR on all examples/*.n6. grammar.js +
queries/highlights.scm + package.json (src/ generated, gitignored).

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

Author: dancinlife

README.md

@@ -176,6 +176,14 @@ Conservative — unrecognised continuations are hints, never hard errors.
 A Claude Code plugin can wire it via `.lsp.json`:
 `{ "n6": { "command": "n6-lsp", "extensionToLanguage": {".n6":"n6"} } }`.
 
+### tree-sitter grammar (`tree-sitter-n6/`)
+
+A tree-sitter grammar for editors on the tree-sitter stack (Neovim, Helix,
+Zed, Emacs). Total line model — every line resolves to `comment` / `header`
+/ `edge` / `body` / `text` / `blank`, exposing `type` and `edge_op` nodes
+for `queries/highlights.scm`. Verified: `tree-sitter parse` reaches **0
+ERROR** on all `examples/*.n6`. Build: `cd tree-sitter-n6 && tree-sitter generate`.
+
 ## Repo layout
 
 ```

tree-sitter-n6/.gitignore

@@ -0,0 +1,2 @@
+src/
+node_modules/

tree-sitter-n6/grammar.js

@@ -0,0 +1,51 @@
+/**
+ * tree-sitter grammar for .n6 (knowledge-atlas grammar, v1).
+ *
+ * Total line model, no external scanner, no regex look-around. Every
+ * line token requires a trailing newline → the top-level repeat always
+ * progresses (no parser hang). .n6 files are LF-terminated by spec.
+ * Exposes `type` + `edge_op` for queries/highlights.scm; quoted prose,
+ * `key = expr` continuations and CJK fall through to `body` / `text`.
+ */
+module.exports = grammar({
+  name: 'n6',
+
+  extras: $ => [],
+
+  rules: {
+    source_file: $ => repeat($._line),
+
+    _line: $ => choice(
+      $.blank,
+      $.comment,
+      $.header,
+      $.edge,
+      $.body,
+      $.text,
+    ),
+
+    blank: $ => token(prec(1, /[ \t]*\n/)),
+
+    comment: $ => token(prec(5, /[ \t]*#[^\n]*\n/)),
+
+    header: $ => seq($.type, $._rest),
+
+    type: $ => token(prec(4, /@[A-Z?]/)),
+
+    edge: $ => seq($._indent, $.edge_op, $._rest),
+
+    body: $ => seq($._indent, $._rest),
+
+    _indent: $ => token(prec(3, /[ \t]+/)),
+
+    // .n6 v1 edge alphabet (7): depends/derives/application/equivalent/
+    // converges/verified/breakthrough
+    edge_op: $ => token(prec(4, choice(
+      '<-', '->', '=>', '==', '~>', '|>', '!!',
+    ))),
+
+    _rest: $ => token(prec(1, /[^\n]*\n/)),
+
+    text: $ => token(prec(0, /[^ \t#@\n][^\n]*\n/)),
+  },
+});

tree-sitter-n6/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "tree-sitter-n6",
+  "version": "0.1.0",
+  "description": "tree-sitter grammar for the .n6 format",
+  "repository": "https://github.com/dancinlab/n6",
+  "license": "CC0-1.0",
+  "keywords": ["tree-sitter", "parser", "n6", "dancinlab"],
+  "tree-sitter": [
+    { "scope": "source.n6", "file-types": ["n6"], "highlights": ["queries/highlights.scm"] }
+  ]
+}

tree-sitter-n6/queries/highlights.scm

@@ -0,0 +1,4 @@
+; tree-sitter highlight query for .n6
+(comment) @comment
+(type) @keyword
+(edge_op) @operator