feat(extraction): add Odin language support

CHANGELOG.md

@@ -11,6 +11,7 @@ and adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### New Features
 
+- CodeGraph now indexes **Odin** (`.odin`) — procedures with their calling conventions and `@(...)` attributes, procedure groups linked to their overloads, structs, enums, unions, bit fields, `distinct` and proc-type aliases, constants, imports, `foreign` blocks, `when` blocks, and call edges that keep their package qualifier so `fmt.println` never links to a procedure of your own. An Odin package is a directory, so imports are recorded as symbols but deliberately left unlinked rather than guessed at a file. The vendored `tree-sitter-odin` v1.3.0 grammar has known gaps that leave an ERROR node in some files — most often a trailing-backslash line continuation in a CRLF working tree, which usually costs nothing but occasionally costs a file's declarations; `docs/grammars/tree-sitter-odin.md` records the measured parse health on four Odin repositories. Thanks @RainerXE, who first proposed Odin support. (#648, #1000)
 - Anonymous usage telemetry is now stored entirely on CodeGraph's own first-party infrastructure — no third-party analytics vendor receives any of it, and the endpoint that receives it makes no outbound requests at all. Individual events are deleted after 90 days, leaving only anonymous daily totals. Nothing about what is collected changed, your IP address is still never read or stored, and every off-switch works exactly as before (`codegraph telemetry off`, `CODEGRAPH_TELEMETRY=0`, `DO_NOT_TRACK=1`). `TELEMETRY.md` remains the complete field-by-field list.
 
 - `codegraph_explore` no longer re-sends source it already returned earlier in the same conversation. A file it has already shown you comes back as a short pointer — the path, the symbols and the exact line range, with confirmation that the file hasn't changed since — and the space that frees is spent on code you haven't seen yet, so a follow-up call covers new ground instead of repeating the last one. If a file was edited in between, its source is always shown again in full. Set `CODEGRAPH_EXPLORE_DEDUP=0` to turn this off.

README.md

@@ -277,7 +277,7 @@ CodeGraph's parsing engine is a **native Rust kernel**: 20 languages — TypeScr
 | **Full-Text Search** | Find code by name instantly across your entire codebase, powered by FTS5 |
 | **Impact Analysis** | Trace callers, callees, and the full impact radius of any symbol before making changes |
 | **Always Fresh** | File watcher uses native OS events (FSEvents/inotify/ReadDirectoryChangesW) with debounced auto-sync — the graph stays current as you code, zero config |
-| **20+ Languages** | TypeScript, JavaScript, ArkTS, Python, Go, Rust, Java, C#, VB.NET, PHP, Ruby, C, C++, CUDA, Objective-C, Metal, Swift, Kotlin, Scala, Dart, Lua, Luau, R, Nix, Erlang, CFML, COBOL, Solidity, Terraform/OpenTofu, Svelte, Vue, Astro, Liquid, Pascal/Delphi |
+| **20+ Languages** | TypeScript, JavaScript, ArkTS, Python, Go, Rust, Java, C#, VB.NET, PHP, Ruby, C, C++, CUDA, Objective-C, Metal, Swift, Kotlin, Scala, Dart, Lua, Luau, R, Nix, Erlang, CFML, COBOL, Solidity, Terraform/OpenTofu, Odin, Svelte, Vue, Astro, Liquid, Pascal/Delphi |
 | **Framework-aware Routes** | Recognizes web-framework routing files and links URL patterns to their handlers across 17 frameworks |
 | **Mixed iOS / React Native / Expo** | Closes cross-language flows that static parsing misses: Swift ↔ ObjC bridging, React Native legacy bridge + TurboModules + Fabric view components, native → JS event emitters, Expo Modules |
 | **100% Local** | No data leaves your machine. No API keys. No external services. SQLite database only |
@@ -799,6 +799,7 @@ is written):
 | Solidity | `.sol` | Full support (contracts, libraries, interfaces, structs, enums, modifiers, events, errors, state variables, `import`/`using` directives, `emit`/`revert` calls) |
 | Terraform / OpenTofu | `.tf`, `.tfvars`, `.tofu` | Full support (resources, data sources, modules, variables, outputs, providers incl. aliases, `locals`; `var.`/`local.`/`module.`/resource references with Terraform's per-directory scoping enforced; module calls bridged across the boundary — inputs to the child module's variables, `module.M.out` to the child's output, `source` to the module's files; cloudposse/atmos `remote-state` cross-component wiring when the component is statically named; `provider = aws.east` selections resolved up the module tree; `moved`/`import`/`removed`/`check` block references; `.tfvars` assignments linked to the variables they set) |
 | Nix | `.nix` | Full support (functions with simple/destructured/curried params, `let`/attrset bindings, `inherit`, `import ./path` file edges — `./dir` resolving through `default.nix` — plus NixOS module `imports = [ ./x.nix ]` lists and `callPackage ./pkg.nix` file edges; call edges; module-system option wiring — a config write like `launchd.user.agents.x = { ... }` links to the module declaring `options.launchd.user.agents`, so option flows trace across modules) |
+| Odin | `.odin` | Full support (procedures incl. calling conventions, `@(...)` attributes as modifiers and `@(private)` visibility, procedure groups linked to their overloads, structs with fields, enums, unions, bit fields, `distinct`/proc-type aliases, `::` constants, `import` with and without an alias, `foreign` blocks, `when` blocks, package-qualified call edges, with an unqualified call scoped to its own package directory. An Odin package is a DIRECTORY rather than a file, so `import` statements are recorded as symbols but are **not** resolved to file edges at all — `import "core:fmt"` and `import "../shared"` alike stay external and unresolved. Note the vendored `tree-sitter-odin` v1.3.0 grammar has gaps that leave an ERROR node in some files — most commonly a trailing-backslash line continuation in a **CRLF** working tree, which is what `odinfmt` emits when it wraps a long line. Recovery is usually local and costs nothing, but not always: measured over 427 files in four Odin repositories, a CRLF checkout extracts 1.7% fewer declarations than the same bytes with LF endings. `docs/grammars/tree-sitter-odin.md` has the per-repository numbers) |
 
 ## Measured cross-file coverage