docs: document the test snapshot commit policy - #54
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Summary
Adds the rule CONTRIBUTING.md's Testing philosophy section was missing: whether to commit a
test_snapshots/file comes down to reproducibility, not test type. Hand-written tests produce a stable file and should commit it;proptest_*modules produce a different file every run and should.gitignorethe module's directory instead.This has been the repo's actual practice throughout, this just writes it down.
Closes #24
Test plan
.gitignorepattern (test_snapshots/test/<module>/) matches what's actually there for both existing proptest modules