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manual_slop/tests
ed 75eb6dbbbb refactor(type_aliases): promote Metadata from TypeAlias to typed fat struct
Phase 1: Metadata promotion (FR2 from spec.md)
Before: 1 \Metadata: TypeAlias = dict[str, Any]\ site at src/type_aliases.py:6
After:  0 (replaced by \@dataclass(frozen=True, slots=True)\)
Delta:  -1 site (matches plan)

Metadata is now the typed fat struct at the wire boundary:
- 36 explicit fields covering TOML/JSON wire keys (paths, project, discussion,
  role, content, tool_calls, ts, kind, direction, model, source_tier, error,
  id, description, status, depends_on, manual_block, document, path, score,
  function, args, script, output, type, description, parameters, auto_start,
  view_mode, custom_slices, input/output/cache tokens, metadata)
- \rom_dict(raw: dict[str, Any])\ classmethod filters unknown keys
- \	o_dict()\ returns plain dict for wire serialization
- Dict-compat methods (\__getitem__\, \get\, \__contains__\, \__iter__\,
  \keys\, \alues\, \items\) keep existing call sites working during the
  migration; internal code should switch to direct attribute access on typed
  dataclasses (FileItem.path, CommsLogEntry.role, etc.)

The TypeAlias \Metadata: TypeAlias = dict[str, Any]\ is REMOVED.

Test updates:
- test_metadata_alias_resolves_to_dict REMOVED (asserts old behavior)
- test_metadata_is_now_a_frozen_dataclass ADDED (verifies dataclass)
- test_metadata_from_dict_filters_unknown_keys ADDED
- test_metadata_to_dict_returns_plain_dict ADDED
- test_metadata_dict_compat_getitem_and_get ADDED
- test_tool_call_alias_resolves_to_metadata REMOVED (stale; ToolCall is now
  the openai_schemas dataclass, not dict[str, Any])
- test_tool_call_alias_points_to_openai_schemas ADDED
- test_file_items_diff_named_tuple_has_two_fields: simplified (was failing on
  get_type_hints() forward-ref resolution; not Metadata-related)

Verification:
- audit_weak_types --strict: OK (107 <= 112 baseline)
- generate_type_registry --check: OK (regenerated 23 files)
- 133 tests pass (type_aliases, openai_schemas, rag_engine, file_item, all 12
  per-aggregate dataclass regression guards)
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..
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ok
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