fix(frame): treat a bare @reverse term as reference-valued

[simontaurus]

Port of OO-LD/oold-js#4; same defect, since this module is a port.

reference_properties keyed on "@type": "@id" alone, so a term mapped with @reverse was only recognised when the author also wrote the coercion - which JSON-LD 1.1 §4.1.10 makes redundant, since a reverse term's values are node references by definition. Without the subframe, framing embeds the reverse targets, which is the defect OO-LD/oold-schema#160 closed.

Every existing fixture passed because the specification's worked example writes both spellings. Spec change: OO-LD/oold-schema#181.

504 passed, 7 skipped across tests/test_validation/.

[github-actions]

Release preview

Merging this PR would release v1.0.2 (current: v1.0.1).

Changelog preview (truncated)

## v1.0.2 (2026-09-21)

### Bug Fixes

- **frame**: Treat a bare @reverse term as reference-valued
  ([`82724e1`](https://github.com/OO-LD/oold-python/commit/82724e143868b9272d873fa4e597747646cf859a))

_{Preview via python-semantic-release and conventional commits.}

[github-actions]

📊 Benchmark Results

Click to see benchmark comparison

📊 Benchmark Comparison (threshold: 1.3x)
============================================================

➖ Unchanged (within threshold):
  ➖ test_simple_dict_document_store: 0.0020s → 0.0019s (-0.7%)
  ➖ test_sqlite_document_store: 0.0021s → 0.0021s (-0.3%)
  ➖ test_local_sparql_store: 0.0387s → 0.0381s (-1.6%)
  ➖ test_oneof_subschema: 0.0616s → 0.0616s (-0.1%)
  ➖ test_enum_docstrings: 0.0520s → 0.0519s (-0.2%)
  ➖ test_subclass_inheritance: 0.0550s → 0.0562s (+2.2%)
  ➖ test_class_hierarchy: 0.0524s → 0.0522s (-0.4%)
  ➖ test_core[v1]: 0.0360s → 0.0377s (+4.5%)
  ➖ test_core[v2]: 0.0438s → 0.0447s (+2.0%)
  ➖ test_schema_generation[v1]: 0.0017s → 0.0016s (-1.5%)
  ➖ test_schema_generation[v2]: 0.0038s → 0.0038s (-1.2%)
  ➖ test_simple_json: 0.0007s → 0.0007s (+1.7%)
  ➖ test_complex_graph: 0.0017s → 0.0016s (-0.5%)

============================================================
Summary: 0 regressions, 0 improvements, 13 unchanged
============================================================

✅ No significant performance regressions

Threshold: 1.3x (30% slower triggers a regression warning)

Note: Benchmarks are informational only and won't fail the build.

_{💡 Tip: Download the benchmark-results artifact for detailed JSON data}

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/oold/validation/frame.py	50.0%	1 Missing and 1 partial ⚠️

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