feat: restructure repo, borrow checker, expanded stdlib
- Reorganize repository to Rust-style layout:
compiler/bootstrap/ compiler/selfhost/ compiler/tests/
library/std/ library/runtime/ tests/ tools/
- Add buxs/ Windows-compatible project root
- Add borrow checker tests and implement:
- Alias analysis (double mutable borrow detection)
- Use-after-move detection for own T
- Expand standard library:
- Std::Os: Args, Env, Cwd, Chdir
- Std::Time: NowMs, NowUs, SleepMs
- Std::Process: Run, Output
- Std::Io: PrintInt64 (fixes 32-bit truncation bug)
- Add examples: os_time.bux, process.bux
- Fix PrintInt to use int64_t in C runtime
dimgigov
9c6b516453