fix(evidence): support nested workspace roots

harness/tests/test_evidence_cli.py

@@ -1,10 +1,21 @@
 import json
+import subprocess
 
 from typer.testing import CliRunner
 
 from tht.cli import app
 
 
+def test_evidence_authoring_accepts_a_canonical_workspace_inside_the_git_worktree(tmp_path):
+    from tht.cli.evidence_cmd import _canonical_worktree
+
+    subprocess.run(["git", "init", "--quiet", str(tmp_path)], check=True)
+    workspace_root = tmp_path / "psd-clinical"
+    workspace_root.mkdir()
+
+    assert _canonical_worktree(workspace_root) == workspace_root.resolve()
+
+
 def test_evidence_authoring_commands_are_distinct_from_runtime_preprocessing():
     result = CliRunner().invoke(app, ["evidence", "--help"])