feat: implement muse code migrate for commit-id-v2 DAG replay

Replaces the old git→Muse bridge with the v2 commit ID rewriter: - muse/core/migrate.py: DAG BFS collect, topological sort, v2 ID recompute, bare-sig normalisation, legacy object path migration - muse/cli/commands/migrate.py: CLI wrapper with --dry-run and --json - tests/test_code_migrate.py: 30 tests covering preflight, dry-run, single commit, linear chain, merge commit, branch heads, sig normalisation, idempotency, object path migration, legacy fields - tests/test_migrate.py: deleted (git-bridge; bridge will be muse code bridge)

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muse/cli/commands/migrate.py::Manifestmuse/cli/commands/migrate.py::_CatFile.closemuse/cli/commands/migrate.py::_CatFile.readmuse/cli/commands/migrate.py::import::CommitRecordmuse/cli/commands/migrate.py::import::EnvelopeJsonmuse/cli/commands/migrate.py::import::SnapshotRecordmuse/cli/commands/migrate.py::import::TypedDictmuse/cli/commands/migrate.py::import::append_reflogmuse/cli/commands/migrate.py::import::blob_idmuse/cli/commands/migrate.py::import::compute_commit_idmuse/cli/commands/migrate.py::import::compute_snapshot_idmuse/cli/commands/migrate.py::import::dataclassesmuse/cli/commands/migrate.py::import::datetimemuse/cli/commands/migrate.py::import::hashlibmuse/cli/commands/migrate.py::import::load_json_filemuse/cli/commands/migrate.py::import::make_envelopemuse/cli/commands/migrate.py::import::osmuse/cli/commands/migrate.py::import::pathlibmuse/cli/commands/migrate.py::import::read_refmuse/cli/commands/migrate.py::import::short_idmuse/cli/commands/migrate.py::import::start_timermuse/cli/commands/migrate.py::import::subprocessmuse/cli/commands/migrate.py::import::write_commitmuse/cli/commands/migrate.py::import::write_head_branchmuse/cli/commands/migrate.py::import::write_objectmuse/cli/commands/migrate.py::import::write_snapshotmuse/cli/commands/migrate.py::register

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