Fix canonical dxt expansion

Author: sabino

AGENTS.md

@@ -1,6 +1,6 @@
 # Agent Instructions
 
-This repository is building `dxt`, the Data Transformation eXecutor: a dbt-project-compatible transformation engine with an artifact-first compatibility strategy and later cross-database execution.
+This repository is building `dxt`, Data eXecution & Transformation: a dbt-project-compatible transformation engine with an artifact-first compatibility strategy and later cross-database execution.
 
 Hard requirement: the `dxt` product runtime is Zig. Python may remain only for developer scripts, tests, fixture tooling, compatibility harnesses, and safety scans. Do not implement product CLI, parser, compiler, artifact writer, planner, adapter, or runtime behavior in Python.
 

PLAN.md

@@ -2,7 +2,7 @@
 
 ## Name And Product Contract
 
-`dxt` means **Data Transformation eXecutor**.
+`dxt` means **Data eXecution & Transformation**.
 
 The product goal is a dbt-project-compatible transformation engine written in Zig. The first promise is compatibility with dbt Core project semantics and artifacts, not a private or unofficial dbt fork. Fusion-era capabilities, semantic resources, metrics, static analysis, and cross-database planning shape the architecture, but dbt Core compatibility is the required base.
 

README.md

@@ -1,6 +1,6 @@
 # dxt
 
-`dxt` is the **Data Transformation eXecutor**: a dbt-project-compatible transformation engine written in Zig.
+`dxt` is **Data eXecution & Transformation**: a dbt-project-compatible transformation engine written in Zig.
 
 The first target is dbt Core compatibility for public projects such as Jaffle Shop. The long-term architecture also accounts for semantic resources, metrics, Fusion-style static analysis, and efficient cross-database execution.
 

src/root.zig

@@ -251,7 +251,7 @@ pub fn printRootHelp(writer: *Io.Writer) !void {
     try writer.writeAll(
         \\Usage: dxt [--version] <command> [options]
         \\
-        \\Data Transformation eXecutor: a dbt-project-compatible transformation engine.
+        \\Data eXecution & Transformation: a dbt-project-compatible transformation engine.
         \\
         \\Commands:
         \\  version          Print the dxt version.

tests/test_cli.py

@@ -50,6 +50,13 @@ def test_version_command():
     assert result.stderr == ""
 
 
+def test_root_help_uses_canonical_name():
+    result = subprocess.run([DXT, "--help"], cwd=ROOT, check=True, text=True, capture_output=True)
+    assert "Data eXecution & Transformation" in result.stdout
+    assert "Data Transformation eXecutor" not in result.stdout
+    assert result.stderr == ""
+
+
 def copy_fixture(tmp_path: Path, name: str) -> Path:
     source = ROOT / "tests" / "fixtures" / name
     dest = tmp_path / name