SpamScope / mail-parser / 36933715624

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fix: preserve mail evidence and correct RFC parsing (#180)

* fix: preserve mail evidence and correct RFC parsing

Preserve file octets and MIME metadata, validate date semantics, include
named inline text in body views, decode display words in lexical context,
and scan Received fields structurally with safe sender-IP attribution.
Keep recovery diagnostics and raw evidence, including unsafe codec output.

Add targeted regressions and audited corpus fingerprints. Document the
intentional file-input charset compatibility change and shared review rules.

RFC review: RFC 5322 sections 3.3, 3.4, 3.6.7, 4 and 5; RFC 5321 section
4.4; applicable RFC 2045/2046, 2047, 2183, 2231 and 6532 requirements.

Validation: 1238 tests and 5 subtests passed on Python 3.13 and 3.14;
69 corpus cases checked across Python 3.9-3.14 without new exceptions.
Pre-commit, lint and Pyright passed. Dedicated security review completed;
all reproduced High/Medium findings fixed and retested.

* docs: enhance README with package distribution and integration details

* test: replace timing assertions with deterministic work budgets

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