feat(extract): tree-sitter-based Dart extraction with source_location line anchors

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 Full release notes with details on each version: [GitHub Releases](https://github.com/safishamsi/graphify/releases)
 
+## Unreleased
+
+- Feat: Dart extraction is now tree-sitter-based, with real `source_location` line anchors (optional `graphifyy[dart]` extra). The regex extractor emitted `source_location: None` on every Dart node and edge, so Dart was the one mainstream language whose symbols downstream consumers couldn't jump to or read by line range. `extract_dart` now parses with the community `tree-sitter-dart` grammar: declarations (classes, mixins, enums, extension types, extensions, typedefs), imports/exports, `part of` redirection, annotations, and functions come from the AST with `L{n}` anchors on nodes and edges. The Flutter-framework heuristics (Bloc events/emissions, Riverpod providers, navigation routes) and Dart 3 pattern-destructured variables — which the young grammar still parses with ERROR nodes — stay on the proven regexes, now also line-anchored via match offsets. The AST also fixes two long-standing regex false-positive classes: declarations inside string literals no longer produce phantom nodes, and multi-line named/optional parameter lists (`required String id,` at declaration indent) no longer leak parameters as variable nodes. Without the extra installed, extraction falls back to the previous regex extractor unchanged (same optional-grammar pattern as `extract_pascal`, #781).
+
 ## 0.9.24 (2026-07-22)
 
 - Fix: the XAML code-behind `.cs` scan is now bounded and prunes noise dirs, so it can't hang. `_xaml_csharp_class_nodes` used `rglob("*.cs")` over a project root resolved by walking up for a `.csproj`/`.sln`; a standalone `extract_xaml` on a `.xaml` under a large or shared parent (a temp dir, a big monorepo) could resolve the root to a broad ancestor and then recursively scan the whole tree. It now walks with `node_modules`/`.venv`/`.git`/dot-dir pruning and a directory cap, so a real project scans fully while a runaway root degrades to a fast partial scan.

README.md

@@ -331,7 +331,7 @@ To remove graphify from all platforms at once: `graphify uninstall` (add `--purg
 
 | Type | Extensions |
 |------|-----------|
-| Code (36 tree-sitter grammars) | `.py .ts .mts .cts .js .jsx .tsx .mjs .go .rs .java .c .cpp .cc .cxx .h .hpp .cu .cuh .metal .rb .cs .kt .kts .scala .php .swift .lua .luau .toc .zig .ps1 .psm1 .psd1 .ex .exs .m .mm .jl .vue .svelte .astro .groovy .gradle .dart .v .sv .svh .sql .f .f90 .f95 .f03 .f08 .pas .pp .dpr .dpk .lpr .inc .dfm .lfm .lpk .sh .bash .json .dm .dme .dmi .dmm .dmf .sln .slnx .csproj .fsproj .vbproj .xaml .razor .cshtml` (`.dm`/`.dme` requires `uv tool install graphifyy[dm]`; `.mts`/`.cts` reuse the TypeScript grammar, `.cc`/`.cxx` and CUDA `.cu`/`.cuh` and Metal `.metal` reuse the C++ grammar) |
+| Code (36 tree-sitter grammars) | `.py .ts .mts .cts .js .jsx .tsx .mjs .go .rs .java .c .cpp .cc .cxx .h .hpp .cu .cuh .metal .rb .cs .kt .kts .scala .php .swift .lua .luau .toc .zig .ps1 .psm1 .psd1 .ex .exs .m .mm .jl .vue .svelte .astro .groovy .gradle .dart .v .sv .svh .sql .f .f90 .f95 .f03 .f08 .pas .pp .dpr .dpk .lpr .inc .dfm .lfm .lpk .sh .bash .json .dm .dme .dmi .dmm .dmf .sln .slnx .csproj .fsproj .vbproj .xaml .razor .cshtml` (`.dm`/`.dme` requires `uv tool install graphifyy[dm]`; `.dart` uses tree-sitter (with `source_location` line anchors) via `graphifyy[dart]` and falls back to a regex extractor without it; `.mts`/`.cts` reuse the TypeScript grammar, `.cc`/`.cxx` and CUDA `.cu`/`.cuh` and Metal `.metal` reuse the C++ grammar) |
 | Salesforce Apex | `.cls .trigger` (regex-based; classes, interfaces, enums, methods, triggers, SOQL/DML edges) |
 | Terraform / HCL | `.tf .tfvars .hcl` (requires `uv tool install graphifyy[terraform]`) |
 | MCP configs | `.mcp.json` `mcp.json` `mcp_servers.json` `claude_desktop_config.json` — extracts server nodes, package refs, env var requirements |