feat: add safe vtl archive pipeline#7
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Add a coldstore-vtl crate with an in-memory VTL simulator and safe command-spec/discovery helpers for mhVTL preparation.\n\nBridge the simulator into the tape service behind a TapeBackend abstraction, then wire scheduler archive batching through CacheArchiveClient and TapeArchiveClient adapters. The archive path is covered by in-process metadata/cache/tape gRPC tests and remains free of live mhVTL or host /dev access.\n\nUpdate safe verification targets and docs to describe the current Phase-1 archive pipeline.
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Summary
coldstore-vtlwith safe mhVTL command specs, discovery parsing, and an in-memory VTL simulatorcoldstore-tapethroughTapeBackendand service-level filemark read/write testsCacheArchiveClientandTapeArchiveClientgRPC adapters, persistingArchiveBundlefilemark metadata and clearing stagingTest Plan
make check-safeSafety
/dev/st*,/dev/nst*,/dev/sg*, or/dev/sch*access