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WIP: mmap/munmap implementation + polyhal fix (local save)

Closed StellaOS requested to merge feat/mmap-layer1 into feature/simple_fs_pagecache
  • MapBackend enum (Anonymous/FileBacked) in memory_set.rs
  • MapArea gains backend field, defaults to Anonymous
  • mmap_register() / munmap() on MemorySet
  • handle_page_fault: FileBacked branch reads from inode
  • sys_mmap / sys_munmap in syscall/process.rs
  • PCB gains mmap_base field
  • syscall args extended to [usize; 6]
  • Remove write_volatile debug markers from vendor polyhal change()
  • Fix user/src/linker-riscv64.ld (was broken symlink text)

Known issue: kernel hangs after page table switch — low VA kernel code not mapped in user page table after restore() zeros entries[0..0x100]. Need to investigate high-VA kernel mapping.