feat(sysctl): typed @sysctl global variables#20

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congwang-mk wants to merge 14 commits intomainfrom

feature/sysctl-support

Commits on May 5, 2026

feat(sysctl): parse @sysctl attribute on global var declarations
congwang-mk
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fix(sysctl): align make_global_var_decl naming and round-trip attributes
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Commits on May 6, 2026

feat(sysctl): validate @sysctl declarations (path, type, modifiers)
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feat(sysctl): reject sysctl handle access from eBPF and kfunc contexts
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feat(sysctl): thread sysctl path through IR
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feat(sysctl): exclude sysctl globals from eBPF codegen
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feat(sysctl): emit /proc/sys read/write accessors in userspace codegen
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feat(sysctl): rewrite userspace handle reads/writes to accessor calls
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test(sysctl): add end-to-end compile test on examples/sysctl_demo.ks
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feat(sysctl): add sysctl_read_str/sysctl_write_str escape-hatch builtins
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docs(sysctl): document @sysctl attribute and stdlib helpers
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revert(sysctl): remove sysctl_read_str/sysctl_write_str stdlib helpers
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fix(sysctl): evaluate str-assignment source once
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test(strings): match new __src binding in assignment template
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