russell@unturf.com 2f8b7dc737 portal benchmark + 3 mismatch defects fixed ...

Benchmark exercises full save×load matrix across Python/C/asm plus the
mismatch cases (wrong format, truncated input, missing file, corrupt
header). Cases that used to segfault or report wrong paths now degrade
cleanly.

asm (uncommonlisp.s):
- (define var) with no value now binds to VOID instead of segfault
- portal-resume checks sys_read returned full 48-byte header; sanity-
  checks heap_size and heap_base before committing r14/r15 restore.
  Corrupt/truncated portals now return #f cleanly.

py (uncommonlisp.py):
- file-not-found error inside a nested (load) now reports the actual
  missing path (via FileNotFoundError.filename) rather than the outer
  script path.
- _load wraps UnicodeDecodeError (binary file loaded as text) into a
  LispErr with the path; no more raw Python traceback.

tests/portal-benchmark.sh: 50-iter benchmark, 4 parts
  (save / load / cross-process / mismatch-classification).

Representative numbers (this laptop, 2026-04-16):
  setup+save: Python 126ms, C 3ms, asm 0.9ms
  cross-proc: Py→Py 260ms, C→C 6ms, asm→asm 1.5ms
All three test suites still pass: 571 py unit, 131 asm, 189 shared.

2026-04-16 16:57:24 -04:00

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