fix(scripts): keep PowerShell branch-name acronym match case-sensitive (parity with bash)

extensions/git/scripts/powershell/create-new-feature-branch.ps1

@@ -252,7 +252,10 @@ function Get-BranchName {
         if ($stopWords -contains $word) { continue }
         if ($word.Length -ge 3) {
             $meaningfulWords += $word
-        } elseif ($Description -match "\b$($word.ToUpper())\b") {
+        } elseif ($Description -cmatch "\b$($word.ToUpper())\b") {
+            # Case-sensitive (-cmatch) to mirror the bash twin's `grep -qw -- "${word^^}"`:
+            # keep a short word only when its UPPERCASE form appears in the original
+            # (an acronym). -match is case-insensitive and would keep every short word.
             $meaningfulWords += $word
         }
     }

scripts/powershell/create-new-feature.ps1

@@ -111,8 +111,11 @@ function Get-BranchName {
         # Keep words that are length >= 3 OR appear as uppercase in original (likely acronyms)
         if ($word.Length -ge 3) {
             $meaningfulWords += $word
-        } elseif ($Description -match "\b$($word.ToUpper())\b") {
-            # Keep short words if they appear as uppercase in original (likely acronyms)
+        } elseif ($Description -cmatch "\b$($word.ToUpper())\b") {
+            # Keep short words if they appear as uppercase in original (likely acronyms).
+            # Use -cmatch (case-sensitive) so this matches the bash twin's
+            # case-sensitive `grep "\b${word^^}\b"`; -match would also match the
+            # lowercased word and keep every short word regardless of case.
             $meaningfulWords += $word
         }
     }

tests/extensions/git/test_git_extension.py

@@ -298,6 +298,24 @@ def test_creates_branch_sequential(self, tmp_path: Path):
         assert data["BRANCH_NAME"] == "001-user-auth"
         assert data["FEATURE_NUM"] == "001"
 
+    def test_branch_name_short_word_case_sensitivity(self, tmp_path: Path):
+        """A short word is dropped from the derived branch name unless it appears
+        as an acronym in UPPERCASE in the description (case-sensitive, must match the
+        PowerShell twin)."""
+        project = _setup_project(tmp_path)
+        # lowercase "go" (<3 chars, not an uppercase acronym) is dropped
+        r1 = _run_bash(
+            "create-new-feature-branch.sh", project, "--json", "--dry-run", "Add go support",
+        )
+        assert r1.returncode == 0, r1.stderr
+        assert json.loads(r1.stdout)["BRANCH_NAME"] == "001-support"
+        # uppercase "GO" is kept as an acronym
+        r2 = _run_bash(
+            "create-new-feature-branch.sh", project, "--json", "--dry-run", "Use GO now",
+        )
+        assert r2.returncode == 0, r2.stderr
+        assert json.loads(r2.stdout)["BRANCH_NAME"] == "001-use-go-now"
+
     def test_creates_branch_timestamp(self, tmp_path: Path):
         """Extension create-new-feature-branch.sh creates timestamp branch."""
         project = _setup_project(tmp_path)
@@ -426,6 +444,21 @@ def test_creates_branch_sequential(self, tmp_path: Path):
         data = json.loads(result.stdout)
         assert data["BRANCH_NAME"] == "001-user-auth"
 
+    def test_branch_name_short_word_case_sensitivity(self, tmp_path: Path):
+        """PowerShell must match the bash twin: a short word is dropped unless it
+        appears as an acronym in UPPERCASE (case-sensitive -cmatch, not -match)."""
+        project = _setup_project(tmp_path)
+        r1 = _run_pwsh(
+            "create-new-feature-branch.ps1", project, "-Json", "-DryRun", "Add go support",
+        )
+        assert r1.returncode == 0, r1.stderr
+        assert json.loads(r1.stdout)["BRANCH_NAME"] == "001-support"
+        r2 = _run_pwsh(
+            "create-new-feature-branch.ps1", project, "-Json", "-DryRun", "Use GO now",
+        )
+        assert r2.returncode == 0, r2.stderr
+        assert json.loads(r2.stdout)["BRANCH_NAME"] == "001-use-go-now"
+
     def test_dry_run_counts_branches_checked_out_in_worktrees(self, tmp_path: Path):
         """Branches checked out in sibling worktrees still reserve their prefix."""
         project = _setup_project(tmp_path / "project")

tests/test_timestamp_branches.py

@@ -240,6 +240,17 @@ def test_sequential_default_with_existing_specs(self, git_repo: Path):
         assert branch is not None
         assert re.match(r"^\d{3,}-new-feat$", branch), f"unexpected branch: {branch}"
 
+    def test_branch_name_short_word_case_sensitivity(self, git_repo: Path):
+        """A short word is dropped from the derived branch name unless it appears
+        as an acronym in UPPERCASE in the description. The PowerShell twin must use
+        case-sensitive -cmatch to produce the same result."""
+        r1 = run_script(git_repo, "--json", "--dry-run", "Add go support")
+        assert r1.returncode == 0, r1.stderr
+        assert json.loads(r1.stdout)["BRANCH_NAME"] == "001-support"
+        r2 = run_script(git_repo, "--json", "--dry-run", "Use GO now")
+        assert r2.returncode == 0, r2.stderr
+        assert json.loads(r2.stdout)["BRANCH_NAME"] == "001-use-go-now"
+
     def test_sequential_ignores_timestamp_dirs(self, git_repo: Path):
         """Sequential numbering skips timestamp dirs when computing next number."""
         (git_repo / "specs" / "002-first-feat").mkdir(parents=True)
@@ -272,6 +283,25 @@ def test_powershell_scanner_uses_long_tryparse_for_large_prefixes(self):
         assert "[long]::TryParse($matches[1], [ref]$num)" in content
         assert "$num = [int]$matches[1]" not in content
 
+    @pytest.mark.skipif(not _has_pwsh(), reason="pwsh not installed")
+    def test_branch_name_short_word_case_sensitivity(self, ps_git_repo: Path):
+        """Core create-new-feature.ps1 must drop a short word unless it appears as
+        an acronym in UPPERCASE (case-sensitive -cmatch), matching the bash twin."""
+        script = ps_git_repo / "scripts" / "powershell" / "create-new-feature.ps1"
+
+        def _run(desc: str) -> subprocess.CompletedProcess:
+            return subprocess.run(
+                ["pwsh", "-NoProfile", "-File", str(script), "-Json", "-DryRun", desc],
+                cwd=ps_git_repo, capture_output=True, text=True,
+            )
+
+        r1 = _run("Add go support")
+        assert r1.returncode == 0, r1.stderr
+        assert json.loads(r1.stdout)["BRANCH_NAME"] == "001-support"
+        r2 = _run("Use GO now")
+        assert r2.returncode == 0, r2.stderr
+        assert json.loads(r2.stdout)["BRANCH_NAME"] == "001-use-go-now"
+
 
 # ── check_feature_branch Tests ───────────────────────────────────────────────