feat: flavor-correct rmgr scaffold; record C-15/C-23 file-wins

RMGR-WP-0004-T03: project repos get GOAL.md and a required prefix.
RMGR-WP-0005-T06 implemented in state-hub consistency.

tests/test_scaffold.py

@@ -0,0 +1,65 @@
+from pathlib import Path
+
+from repo_manager.cli import main
+from repo_manager.commands.scaffold import scaffold_repository
+from repo_manager.standards import check_repository
+
+
+def test_prj_scaffold_requires_prefix(tmp_path: Path):
+    dest = tmp_path / "prj-example"
+    result = scaffold_repository(dest, flavor="project", commit=False)
+    assert result.status == "rejected"
+    assert "wp-prefix" in (result.error or {}).get("message", "").lower() or "PRJ" in str(
+        result.error
+    )
+
+
+def test_prj_scaffold_refuses_flavor_prefix(tmp_path: Path):
+    dest = tmp_path / "prj-example"
+    result = scaffold_repository(dest, flavor="project", wp_prefix="PRJ-WP", commit=False)
+    assert result.status == "rejected"
+
+
+def test_prj_scaffold_writes_goal_not_intent(tmp_path: Path):
+    dest = tmp_path / "prj-example-cutover"
+    result = scaffold_repository(
+        dest, flavor="project", wp_prefix="EXCO-WP", commit=False
+    )
+    assert result.status == "applied"
+    assert (dest / "GOAL.md").is_file()
+    assert not (dest / "INTENT.md").exists()
+    goal = (dest / "GOAL.md").read_text()
+    for heading in ("Outcome", "Invariants", "Success gates", "Project retirement"):
+        assert heading in goal
+    assert not list((dest / "workplans").glob("*-0001-*.md"))
+    report = check_repository(dest)
+    assert report.ok, report.to_dict()
+
+
+def test_durable_scaffold_writes_intent(tmp_path: Path):
+    dest = tmp_path / "some-tool"
+    result = scaffold_repository(dest, flavor="tooling", commit=False)
+    assert result.status == "applied"
+    assert (dest / "INTENT.md").is_file()
+    assert not (dest / "GOAL.md").exists()
+    assert (dest / "workplans" / "SOMETOOL-WP-0001-foundation.md").is_file()
+    report = check_repository(dest)
+    assert report.ok, report.to_dict()
+
+
+def test_cli_scaffold(tmp_path: Path):
+    dest = tmp_path / "cli-tool"
+    assert (
+        main(
+            [
+                "scaffold",
+                "--path",
+                str(dest),
+                "--flavor",
+                "tooling",
+                "--no-commit",
+            ]
+        )
+        == 0
+    )
+    assert (dest / "INTENT.md").is_file()