feat(admin-config-tool): tasks 5.1-5.3 - mapping/wire coverage confirmed, schema bundling fix

5.1 (mapping) and 5.2 (wire framing) are already fully satisfied by
task 2.3's test_mapping.py and task 2.4's test_wire.py -- no new
tests, would have been pure duplication.

5.3: test_schema_bundling.py cross-checks both bundling mechanisms
(capnp schema, JSON validation schemas) resolve consistently under
the active install, and found a real gap: a corrupted bundled JSON
schema crashed validate_yaml() with a raw json.JSONDecodeError
instead of a clean ValidationError. Fixed in xcecommon/validation.py.

src/xceadmin/tests/test_schema_bundling.py

@@ -0,0 +1,137 @@
+"""Cross-cutting bundling tests for ``xcecommon.schema`` and
+``xcecommon.validation`` (design.md, File Structure Plan; Requirements
+5.5, 7.4).
+
+``xcecommon.schema``'s own missing/corrupted-``controller.capnp``
+handling is already exhaustively covered in ``test_schema.py`` (task
+2.2). This file's job is narrower: prove both bundling mechanisms
+(capnp schema, JSON validation schemas) resolve consistently under
+whichever install is currently active, and close the one confirmed gap
+task 5.3 found -- a corrupted *JSON* validation schema (as opposed to a
+corrupted ``controller.capnp``) crashed with a raw
+``json.JSONDecodeError`` instead of a clean ``ValidationError``, since
+``validate_yaml()``'s ``json.loads()`` call had no error handling. Fixed
+in ``xcecommon/validation.py`` alongside this test.
+
+Meaningful confirmation of the pinned (``pip install .``) install path
+requires running this under the release build profile
+(``xce-build.sh xceadmin release``) -- under the default editable
+profile, resolution always succeeds by resolving into the checked-out
+source tree regardless of whether packaging is actually correct.
+"""
+
+from __future__ import annotations
+
+import json
+import shutil
+from pathlib import Path
+
+import pytest
+
+from xcecommon.errors import SchemaNotFoundError, ValidationError
+from xcecommon.schema import default_schema_path, load_schema
+from xcecommon.validation import default_schema_dir, validate_yaml
+
+
+def test_both_bundling_mechanisms_resolve_to_real_existing_paths():
+    """The capnp schema and the JSON validation schemas both resolve to
+    real files under whichever install (editable or pinned) is currently
+    active -- the single check that actually catches a packaging
+    regression like the one bug-1460 found (missing package-data entry
+    silently dropping schema_files/ from a non-editable wheel).
+    """
+    capnp_path = Path(default_schema_path())
+    assert capnp_path.is_file()
+
+    json_dir = Path(default_schema_dir())
+    assert json_dir.is_dir()
+    schema_files = list(json_dir.glob("*.schema.json"))
+    assert len(schema_files) == 7  # one per config file type
+
+
+def test_both_mechanisms_produce_genuinely_parseable_content():
+    mod = load_schema()
+    assert hasattr(mod, "ClusterConfig")
+
+    json_dir = Path(default_schema_dir())
+    for schema_file in json_dir.glob("*.schema.json"):
+        with open(schema_file, encoding="utf-8") as fh:
+            parsed = json.load(fh)  # raises if genuinely not valid JSON
+        assert isinstance(parsed, dict)
+
+
+# ---------------------------------------------------------------------------
+# Corrupted / absent bundled schema -> clean error, not a crash
+# ---------------------------------------------------------------------------
+
+
+@pytest.fixture
+def corrupted_json_schema():
+    """Temporarily corrupts the bundled xce.schema.json, restoring it
+    afterward regardless of test outcome.
+    """
+    target = Path(default_schema_dir()) / "xce.schema.json"
+    backup = target.with_suffix(".json.bak")
+    shutil.copy(str(target), str(backup))
+    try:
+        target.write_text("{not valid json!!!", encoding="utf-8")
+        yield target
+    finally:
+        shutil.move(str(backup), str(target))
+
+
+def test_corrupted_json_schema_raises_validation_error_not_json_decode_error(
+    corrupted_json_schema, tmp_path
+):
+    """The gap this task found: a corrupted bundled *JSON* schema (as
+    opposed to a corrupted controller.capnp) previously crashed with a
+    raw json.JSONDecodeError. validate_yaml() must convert it into a
+    ValidationError instead (7.4's "clear, actionable error" principle,
+    applied here to the JSON validation schemas).
+    """
+    yaml_file = tmp_path / "xce.yaml"
+    yaml_file.write_text("cluster_name: eda1\n", encoding="utf-8")
+
+    with pytest.raises(ValidationError) as exc_info:
+        validate_yaml(str(yaml_file), "xce")
+
+    assert exc_info.value.constraint == "schema-corrupted"
+    assert "corrupted" in exc_info.value.message
+
+
+@pytest.fixture
+def missing_json_schema():
+    target = Path(default_schema_dir()) / "xce.schema.json"
+    backup = target.with_suffix(".json.bak")
+    shutil.move(str(target), str(backup))
+    try:
+        yield target
+    finally:
+        shutil.move(str(backup), str(target))
+
+
+def test_missing_json_schema_raises_validation_error_not_file_not_found_error(
+    missing_json_schema, tmp_path
+):
+    yaml_file = tmp_path / "xce.yaml"
+    yaml_file.write_text("cluster_name: eda1\n", encoding="utf-8")
+
+    with pytest.raises(ValidationError) as exc_info:
+        validate_yaml(str(yaml_file), "xce")
+
+    assert exc_info.value.constraint == "schema-not-found"
+
+
+def test_missing_controller_capnp_raises_schema_not_found_error(monkeypatch, tmp_path):
+    """Parallel case for the capnp side, using the env-var override
+    (xcecommon.schema.load_schema doesn't cache the corrupted-content
+    precheck failure, so this proves the same "clean error, not a
+    crash" contract using the mechanism already established in
+    test_schema.py -- included here for the cross-cutting file's own
+    completeness, not as a duplicate of that file's exhaustive coverage.
+    """
+    missing_path = tmp_path / "does-not-exist.capnp"
+    monkeypatch.setenv("XCEADMIN_SCHEMA_PATH", str(missing_path))
+
+    with pytest.raises(SchemaNotFoundError):
+        load_schema()