fix(agents): only a canonical uuid reaches any claude path (Issue #31, review)

The user asked for no path at all from an id that is not a uuid. bd09c6a
still took `<id>.jsonl` for one (the pre-#31 reach), which has_artifacts and
the residual counted while in-use always said free: `purge claude notes`
deleted notes.jsonl. Now purge, has_artifacts and residual return nothing
for such an id, as in-use already did.

This makes test_a4_adapter_contract.py::test_purge_artifacts_composite fail:
it purges the claude id 'uuid-c' and expects uuid-c.jsonl gone. Editing an
existing test needs the user's approval; the one-line data change
(a canonical uuid in place of 'uuid-c') is kept outside the branch, in job
90efa4ce's report dir. Reverting this commit restores the jsonl-only reach.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_issue31_purge_residual.py

@@ -420,27 +420,29 @@ def test_claude_roots_may_be_links(home, tmp_path, monkeypatch, conv):
     assert adapter.residual_artifacts(conv, ctx) == []
 
 
-def test_a_non_uuid_id_takes_only_its_transcript_file(home, tmp_path):
-    """The pre-#31 reach, kept for ids that are not uuids (test_a4 purges
-    "uuid-c"): the `<id>.jsonl` file, never a directory of that name."""
+@pytest.mark.parametrize("name", ["uuid-c", "memory", "notes"])
+def test_a_non_uuid_id_reaches_nothing(home, tmp_path, name):
+    """Only a uuid names a claude session: no path is built for any other id,
+    not even the `<id>.jsonl` the adapter took before #31."""
     ws = tmp_path / "ws"
     ws.mkdir()
     proj = home / ".claude" / "projects" / workspace_key(str(ws))
     proj.mkdir()
-    jsonl = proj / "uuid-c.jsonl"
-    jsonl.write_text("{}\n")
-    kept = [proj / "uuid-c" / "a", home / ".claude" / "file-history" / "uuid-c" / "b"]
-    for p in kept:
+    jsonl = proj / f"{name}.jsonl"
+    jsonl.write_text(json.dumps({"sessionId": name, "cwd": os.path.realpath(str(ws))}) + "\n")
+    kept = [jsonl, proj / name / "a", home / ".claude" / "file-history" / name / "b"]
+    for p in kept[1:]:
         p.parent.mkdir(parents=True)
         p.write_text("x")
     adapter = get_adapter("claude")
     ctx = _ctx(ws, home)
 
-    assert adapter.has_artifacts("uuid-c", ctx) is True
-    assert adapter.residual_artifacts("uuid-c", ctx) == [str(jsonl)]
-    assert adapter.purge_artifacts("uuid-c", ctx) == [str(jsonl)]
-    assert not jsonl.exists() and all(p.exists() for p in kept)
-    assert adapter.residual_artifacts("uuid-c", ctx) == []
+    assert adapter.has_artifacts(name, ctx) is False
+    assert adapter.residual_artifacts(name, ctx) == []
+    assert adapter.purge_artifacts(name, ctx) == []
+    res = _agents_cli(["purge", "claude", name, str(ws)], ws)
+    assert json.loads(res.stdout)["purged"] == [], res.stdout + res.stderr
+    assert all(p.exists() for p in kept)
 
 
 def test_purge_cli_resolves_claude_from_leftovers_only(home, tmp_path, conv):