feat(fs): add filesystem isolation support #1287
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Issue # (if available)
Closes #686
Description of changes
Add LLRT_FS_ALLOW and LLRT_FS_DENY environment variables to control filesystem access, similar to existing network isolation (LLRT_NET_ALLOW/DENY).
Supports exact paths (/tmp/file.txt), directory prefixes (/tmp/), and glob patterns (/tmp/*.txt).
Checklist
tests/unitand/or in Rust for my feature if neededmake fixto format JS and apply Clippy auto fixesmake checktypes/directoryBy submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.