Eremey Valetov eaa1166d8c Fix QA findings: FRE GC safety, WAIT mask=0, ENVIRON leak, sentinel collision ...

- FRE(): remove strpool_gc() call during expression evaluation — temporaries
  on the C stack would become dangling pointers after compaction
- WAIT: reject mask=0 (would infinite-loop since AND 0 is always 0)
- ENVIRON: use setenv()+free() instead of putenv() to avoid memory leak
  and dangling pointer if pool is compacted
- portio: add bounds check to com1_inp() (com1_out already had one)
- kernel: use CHR$(1) sentinel prefix to avoid collision with user output
- kernel: fix INPUT prompt rfind() edge case when no newline in buffer
- eval.c: enlarge DATE$ format buffer to silence -Wformat-truncation

2026-03-29 06:15:16 -04:00

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