feat: MPack local pack store (issue #70 Phase 1)
New muse/core/pack_store.py implements the MPack binary format: - .muse/objects/pack/sha256/<64hex>.mpack — pack data file - .muse/objects/pack/sha256/<64hex>.idx — sorted seek index
write_pack(): 2 atomic file writes regardless of object count. read_object_from_packs(): binary-search index, seek to content, O(1). has_object_in_packs(): index lookup, no decode. verify_pack(): re-hashes both files against their SHA-256 footers.
object_store.read_object() and has_object() fall through to pack store when the object is absent from loose storage — transparent to all callers.
packs_dir() added to paths.py with algorithm canonical in the path, mirroring the loose object store convention.
sha256:a9e14ae2c66b46d5b2d17e3a53e1486b1ee89c587e88944cf1869e96ed456210
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sha256:2aef619eefc10f9c8b8d982f61899dea2da2853cb7a180a1bed568dc01ed19fd
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