refactor(harmony): Phase 4 — extract patterns.py

Move pattern CRUD, _write_atomic, and serialisation helpers out of the 2210-line harmony __init__.py into a focused muse/core/harmony/patterns.py.

- patterns.py: _MAX_PATTERN_BYTES, _MAX_SCAN, _write_atomic, _pattern_to_dict, _dict_to_pattern, record_pattern, load_pattern, list_patterns, forget_pattern, clear_all (189 lines) - __init__.py: re-exports all extracted symbols; duplicated bodies removed - test_harmony_phase1.py: monkeypatch now targets muse.core.harmony.patterns directly for _MAX_SCAN after it moved out of __init__.py

707/707 harmony tests green.

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Older refactor(harmony): Phase 3 — extract fingerprint.py sha256:8104248901e3a4babe475281ea319cb8a689b1cfa7131e5893e239da5af4106b All commits Newer refactor(harmony): Phase 5 — extract resolutions.py sha256:1878da37bc07f1961cafe0f911bd4d538d1572cd18db3222e50d884612f4960e

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Branch task/harmony-decompose