logs: Add UAR timing and corruption pattern investigation logs

Add debugging logs demonstrating Use-After-Remove (UAR) bug manifestation:

gdb-uar-2433.log:
- Shows exact worker corruption pattern in execute_once/remove_worker
- Demonstrates work_pending corruption (232) from first cycle
- Reveals the fatal corruption at cycle 11 (next=0xa)
- Contains full crash backtrace and register state

serial-uar-2433.log:
- Shows string length progression across cycles
- Demonstrates how counter value (11) pushes string to 48 chars
- Captures timestamps showing execution/removal sequence

These logs were instrumental in identifying how stack layout and
string buffer size affect the UAR bug manifestation.

Author: schkovich