Stellux posix cwd semantics#65

Merged

FlareCoding merged 7 commits intostellux-3.0-prototypingfrom

cursor/stellux-posix-cwd-semantics-ccac

Mar 4, 2026

Commits on Mar 4, 2026

feat(fs): add base-relative lookup APIs and node path reconstruction

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feat(sched): track and clean up task cwd references

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feat(syscall): implement cwd syscalls and POSIX-style dirfd path semantics

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fix(cwd): prevent syscall stack overflow and add fs resolver tests

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Deduplicate fs errno mapping and remove dead path_parent

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Fix *at path traversal semantics and path buffer guard

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Reject AT_FDCWD in fchdir

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