fix(native-sidecar): propagate guest wasm deletions and renames to the VM shadow root

[NathanFlurry]

• Guest WASM fs.unlinkSync/fs.rmdirSync/fs.renameSync route kernel-direct, but the deleted/renamed path survived in the VM shadow root, so the exit-time shadow→kernel sync resurrected it (rm exited 0 while the file stayed visible to the same shell, later execs, and vm.exists; gzip left the original behind).
• Mirror kernel-direct deletions and renames into the process shadow tree in service_javascript_fs_sync_rpc.
• Un-breaks the rm removes file and gzip compress and decompress cases in packages/core tests/wasm-commands.test.ts, and adds a cross-exec deletion visibility regression test.

🤖 Generated with Claude Code