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QEMU QemuOpts splits on commas; escape literal commas in the host path as ,, per QEMU convention to prevent option injection and boot failures on paths containing commas. Fix U5: extract b64dec() helper in slim-init.sh Deduplicate the 3-line base64 fallback decode block used by both the slim.mount and slim.cmd handlers into a single b64dec() function. Fix U6: add multi-mount test case test_mount now passes two --mount flags and asserts both slim0 and slim1 9p tags appear, covering the multi-mount tag-generation path.