feat(fs): add ordinary directory creation and observation - #1012
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sanohiro
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September 10, 2026 03:45
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Adds fs.create_dir(path) and fs.is_dir(path) for ordinary path-based directory operations. Creation creates one directory under the process umask; observation follows symlinks and returns false only after successfully observing a non-directory. Missing or inaccessible paths remain errors.
Both APIs borrow validated UTF-8 paths without retaining them. HIR/MIR certification and native output validation cover the new operations. Plan 43 records the reviewed contract and closure matrix; retained byte-path operations remain a separate capability.
Validation: 40 filesystem driver tests, malformed native/HIR/MIR owners, platform-adapted umask and permission tests, runtime ABI exports, bounded gate, and workspace Clippy. Independent full-diff review found no P1/P2 issues.