- Enabled SUM (Supervisor Access to User Memory) in riscv_init to allow kernel loader to write to user stacks.
- Removed dangerous 'csrc sstatus' in kload_phys that revoked access.
- Aligned global fiber stacks to 4096 bytes to prevent unmapped page faults at stack boundaries.
- Restored 'boot.o' linking to fix silent boot failure.
- Implemented 'fiber_can_run_on_channels' stub to satisfy Membrane linking.
- Defined kernel stack in header.zig to fix '__stack_top' undefined symbol.
- Resolved duplicate symbols in overrides.c and nexshell.
Markus Maiwald