✨ Add oxlint-tsgolint for type-aware linting

Activates type-aware rules via oxlint --type-aware, backed by
oxlint-tsgolint (TypeScript-Go). Catches unsafe type assertions,
unnecessary type parameters, and other issues regular oxlint
cannot see.

- Add oxlint-tsgolint devDep + 6 platform-specific native bindings
  as optionalDependencies (same pattern as oxlint)
- Add --type-aware flag to check:oxlint
- Add 6 @oxlint-tsgolint/* platforms to check:outdated ignore list
- Disable 3 type-aware rules in .oxlintrc.json with rationale:
  - typescript/no-unsafe-type-assertion, typescript/no-unnecessary-type-parameters:
    fire on legitimate generic type machinery in keysMatch/MatchBuilder
    that needs type-system restructuring (deferred to a follow-up)
  - typescript/no-floating-promises in test files: expectTypeOf() is
    a sync type-assertion library that oxlint-tsgolint misidentifies

Code simplifications enabled by the new strict checks:
- src/match.ts: drop value as unknown casts (T is already assignable
  to unknown) and the redundant run(value) as R cast
- src/index.test.ts: drop unnecessary 'X' as 'X | Y' assertions in
  match<...>(...) calls (literals are already assignable to the union)

Documentation updates in project-specs.md and README.md. Add
'tsgolint' to cspell word list.

package.json

@@ -38,9 +38,9 @@
         "check": "npm run check:tsc && npm run check:oxlint && npm run check:oxfmt && npm run check:cspell && npm run check:knip && npm run check:outdated",
         "check:cspell": "cspell lint ${LEFTHOOK_FILES:-.}",
         "check:knip": "knip --include dependencies,exports,files",
-        "check:outdated": "check-outdated --ignore-pre-releases --ignore-packages @oxfmt/binding-darwin-arm64,@oxfmt/binding-darwin-x64,@oxfmt/binding-linux-arm64-gnu,@oxfmt/binding-linux-arm64-musl,@oxfmt/binding-linux-x64-gnu,@oxfmt/binding-linux-x64-musl,@oxfmt/binding-win32-x64-msvc,@oxlint/binding-darwin-arm64,@oxlint/binding-darwin-x64,@oxlint/binding-linux-arm64-gnu,@oxlint/binding-linux-arm64-musl,@oxlint/binding-linux-x64-gnu,@oxlint/binding-linux-x64-musl,@oxlint/binding-win32-x64-msvc",
+        "check:outdated": "check-outdated --ignore-pre-releases --ignore-packages @oxfmt/binding-darwin-arm64,@oxfmt/binding-darwin-x64,@oxfmt/binding-linux-arm64-gnu,@oxfmt/binding-linux-arm64-musl,@oxfmt/binding-linux-x64-gnu,@oxfmt/binding-linux-x64-musl,@oxfmt/binding-win32-x64-msvc,@oxlint/binding-darwin-arm64,@oxlint/binding-darwin-x64,@oxlint/binding-linux-arm64-gnu,@oxlint/binding-linux-arm64-musl,@oxlint/binding-linux-x64-gnu,@oxlint/binding-linux-x64-musl,@oxlint/binding-win32-x64-msvc,@oxlint-tsgolint/darwin-arm64,@oxlint-tsgolint/darwin-x64,@oxlint-tsgolint/linux-arm64,@oxlint-tsgolint/linux-x64,@oxlint-tsgolint/win32-arm64,@oxlint-tsgolint/win32-x64",
         "check:oxfmt": "oxfmt --check ${LEFTHOOK_FILES:-.}",
-        "check:oxlint": "oxlint ${LEFTHOOK_FILES:-src}",
+        "check:oxlint": "oxlint --type-aware ${LEFTHOOK_FILES:-src}",
         "check:tsc": "tsc",
         "clean": "node -e \"fs.rmSync('dist', { recursive: true, force: true })\"",
         "fix:oxfmt": "oxfmt ${LEFTHOOK_FILES:-.}",
@@ -65,6 +65,7 @@
         "lefthook": "^2.1.12",
         "oxfmt": "^0.66.0",
         "oxlint": "^1.81.0",
+        "oxlint-tsgolint": "^7.0.2001",
         "publint": "^0.3.24",
         "typescript": "^7.0.2"
     },
@@ -76,6 +77,12 @@
         "@oxfmt/binding-linux-x64-gnu": "^0.66.0",
         "@oxfmt/binding-linux-x64-musl": "^0.66.0",
         "@oxfmt/binding-win32-x64-msvc": "^0.66.0",
+        "@oxlint-tsgolint/darwin-arm64": "^7.0.2001",
+        "@oxlint-tsgolint/darwin-x64": "^7.0.2001",
+        "@oxlint-tsgolint/linux-arm64": "^7.0.2001",
+        "@oxlint-tsgolint/linux-x64": "^7.0.2001",
+        "@oxlint-tsgolint/win32-arm64": "^7.0.2001",
+        "@oxlint-tsgolint/win32-x64": "^7.0.2001",
         "@oxlint/binding-darwin-arm64": "^1.81.0",
         "@oxlint/binding-darwin-x64": "^1.81.0",
         "@oxlint/binding-linux-arm64-gnu": "^1.81.0",