feat: initial JSONLT implementation

Author: tbhb

.github/workflows/ci.yml

@@ -55,13 +55,14 @@ jobs:
         uses: reviewdog/action-actionlint@83e4ed25b168066ad8f62f5afbb29ebd8641d982 # v1.6.8
 
   test:
-    name: "Test (Python ${{ matrix.python-version }})"
+    name: "Test (${{ matrix.os }}, Python ${{ matrix.python-version }})"
     needs: lint
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     timeout-minutes: 15
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t"]
 
     steps:
@@ -95,7 +96,7 @@ jobs:
         run: just test-coverage
 
       - name: Upload coverage to Codecov
-        if: matrix.python-version == '3.10'
+        if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.10'
         uses: codecov/codecov-action@5a1091511ad55cbe89839c7260b706298ca349f7 # v5.5.1
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.vale.ini

@@ -14,5 +14,5 @@ Google.Will = NO
 proselint.Annotations = NO
 
 # Internal/temporary files - skip linting
-[{.claude/**/*.md,.oaps/**/**.md,tmp/**/*.md}]
+[{.claude/**/*.md,.oaps/**/**.md,tmp/**/*.md,PLAN.md}]
 BasedOnStyles =