chore: improve test infrastructure

.github/workflows/test.yml

@@ -13,10 +13,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install bats-core
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y bats
+      - name: Setup Bats
+        uses: bats-core/bats-action@e412797c46257a2dbf3775f6f6010b33ee6cb99f # v3.0.1
 
       - name: Run all bats tests
         run: bats tests/formats/ tests/scripts/

tests/formats/test-comment-edge-cases.bats

@@ -4,7 +4,8 @@
 # Verifies that emojis, code blocks, non-ASCII text, markdown formatting,
 # and metadata-like body content don't break parsing patterns.
 
-SAMPLE="tests/formats/sample-comments-edge-cases.md"
+REPO_ROOT="$(cd "$BATS_TEST_DIRNAME/../.." && pwd)"
+SAMPLE="$REPO_ROOT/tests/formats/sample-comments-edge-cases.md"
 
 # --- Emojis ---
 

tests/formats/test-comment-parsing.bats

@@ -4,7 +4,8 @@
 # These are load-bearing patterns used by shell scripts -- cross-platform
 # breakage (BSD vs GNU) must be caught here.
 
-SAMPLE="tests/formats/sample-comments-hawksbury.md"
+REPO_ROOT="$(cd "$BATS_TEST_DIRNAME/../.." && pwd)"
+SAMPLE="$REPO_ROOT/tests/formats/sample-comments-hawksbury.md"
 
 # --- Basic ID operations ---
 

tests/formats/test-tree-parsing.bats

@@ -4,7 +4,8 @@
 # Mirrors the comment parsing tests -- ensures tree format is equally
 # well-tested for downstream shell scripts (Tasks 3-6).
 
-SAMPLE="tests/formats/sample-tree-hawksbury.md"
+REPO_ROOT="$(cd "$BATS_TEST_DIRNAME/../.." && pwd)"
+SAMPLE="$REPO_ROOT/tests/formats/sample-tree-hawksbury.md"
 
 # --- Header structure ---