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SYSCALL-MIGRATION-PLAN.md:
- Detailed analysis of upstream 0.9.0 BREAKING changes (FD reservation refactor,
removed syscalls, new *_into variants)
- Complete consumer impact catalog: 2 bootstrap call sites, 7 kernel/relibc
constant references, 26 recipes (no impact)
- 5-phase migration plan: bootstrap→kernel→relibc→syscall sync→full build
- Risk assessment with rollback procedure
- Clear migration table: old API → new API for each deprecated function/constant
- Execution order with time estimates (~1-2 days total)