refactor(store): Phase 3 — extract commit layer to muse.core.commits

Move CommitRecord, CommitDict, MissingParentError, WalkResult, and all commit I/O functions (write_commit, read_commit, resolve_commit_ref, etc.) from store.py into muse/core/commits.py.

Extract shared deserializer helpers (_str_val, _int_val, _str_or_none, _str_list, _str_dict, _float_val) into muse/core/record_helpers.py to avoid circular imports with SnapshotRecord/TagRecord/ReleaseRecord that remain in store.py.

store.py re-exports all extracted symbols for backward-compatible imports. No callers need updating — existing from muse.core.store import X still works.

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3 changed · 1054 in snapshot files

sha256:515772ea63ec7cdd57c22f6b69c82a30d8d80cc2b95e4a947a90c1ab51f56218 snapshot

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+ muse/core/commits.py .py

+ muse/core/record_helpers.py .py

~ muse/core/store.py .py

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muse/core/store.py::CommitDictmuse/core/store.py::CommitReadCorruptmuse/core/store.py::CommitReadNotFoundmuse/core/store.py::CommitReadOkmuse/core/store.py::CommitRecordmuse/core/store.py::CommitRecord.from_dictmuse/core/store.py::CommitRecord.to_dictmuse/core/store.py::MissingParentErrormuse/core/store.py::WalkResultmuse/core/store.py::commit_existsmuse/core/store.py::commit_pathmuse/core/store.py::commit_read_is_corruptmuse/core/store.py::commit_read_is_not_foundmuse/core/store.py::commit_read_is_okmuse/core/store.py::find_commits_by_prefixmuse/core/store.py::get_all_commitsmuse/core/store.py::get_commits_for_branchmuse/core/store.py::get_head_snapshot_idmuse/core/store.py::overwrite_commitmuse/core/store.py::read_commitmuse/core/store.py::read_commit_resultmuse/core/store.py::resolve_commit_refmuse/core/store.py::update_commit_metadatamuse/core/store.py::walk_commits_betweenmuse/core/store.py::walk_commits_between_resultmuse/core/store.py::write_commit

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Branch task/store-phase3-commits