feat: implement MPack streaming protocol

- muse/core/mpack.py: frame TypedDicts (H/O/C/E/P/X/R/A), MPackStreamWriter, MPackStreamReader, canonical header payload for Ed25519 signing - muse/core/compression.py: zstd tier (ZSTD_AVAILABLE, compress_zstd, decompress_zstd, choose_compression, compress_and_encode, decompress_frame) - muse/core/pack.py: PackBundle→MPackBundle, MPackSummary, build_pack→build_mpack, apply_pack→apply_mpack, build_pack_from_walk→build_mpack_from_walk - verify_pack.py: fix hash comparison to use sha256: prefix - All pack→mpack renames across cli commands, transport, and tests - New test files: test_mpack_frames, test_mpack_stream, test_mpack_compression, test_mpack_bundle, test_mpack_perf, test_mpack_core, test_mpack_oserror_integrity, test_mpack_snapshot_integrity, test_mpack_cmd_verify, test_mpack_cmd_pack_unpack, test_mpack_perf_ops (134 tests, all green)

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All commits Newer feat(mpack): wire MPackStreamWriter/Reader into transport push_s… sha256:67412443a7c7cb446b2b87fb467f126a68a1e4b5e33867dd1280ad33e4cb3d6a

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muse/cli/commands/bundle.py::import::PackBundlemuse/cli/commands/bundle.py::import::apply_packmuse/cli/commands/bundle.py::import::build_packmuse/cli/commands/clone.py::import::apply_packmuse/cli/commands/fetch.py::import::apply_packmuse/cli/commands/pack_objects.py::import::build_packmuse/cli/commands/pull.py::import::apply_packmuse/cli/commands/push.py::import::PackBundlemuse/cli/commands/push.py::import::build_packmuse/cli/commands/push.py::import::build_pack_from_walkmuse/cli/commands/unpack_objects.py::import::PackBundlemuse/cli/commands/unpack_objects.py::import::apply_packmuse/core/pack.py::ApplyResultmuse/core/pack.py::PackBundlemuse/core/pack.py::WireTagmuse/core/pack.py::apply_packmuse/core/pack.py::build_packmuse/core/pack.py::build_pack_from_walkmuse/core/store.pymuse/core/transport.py::HttpTransportmuse/core/transport.py::HttpTransport.fetch_packmuse/core/transport.py::LocalFileTransportmuse/core/transport.py::LocalFileTransport.fetch_packmuse/core/transport.py::LocalFileTransport.push_packmuse/core/transport.py::MuseTransportmuse/core/transport.py::MuseTransport.fetch_packmuse/core/transport.py::import::PackBundlemuse/core/validation.py

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