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Feat: native ints in impure functions (N-13, #232) - #262
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Closes #232
New IR type INT (i64 promoted in place to a PyLong on overflow, no deopt after an effect), pre-boxed constants, cached global and builtin reads behind the dict-watcher epoch. The cache holds borrowed pointers (PyUnstable_EnableTryIncRef/TryIncRef + epoch recheck on 3.15t), so no object lives longer than in CPython (weakref and del lifetime tests).
Red: test_native_int_impure.py on the develop compiler 13 failed, 22 passed. Local 3.15t full suite: 1264 passed, 3 skipped.
Benchmark compiled set vs develop: wordfreq gains word_of and main; all others identical (nbody compiles nothing on both, #220).
Interleaved, 7 pairs, load 4.5 to 6 (not quiet): wordfreq 1.6x vs CPython (develop 1.1x); spectral-norm 48.7x, fannkuch 20.9x.