various safety and correctness improvements#301
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Require Header implementors to report the full structure size and derive payload_len() from it. Validate undersized reports before building DynSizedStructure values, and use the reported total size for tag iteration as well. This makes the reported size the single source of truth. The old shape spread the invariant across payload_len(), total_size(), and per-type assertions, which was easy to drift out of sync. With one authoritative value, the parsing code can validate once and reuse the same size for construction, iteration, and downstream casts. Update the concrete header types in multiboot2 and multiboot2-header to the new contract, and add a regression test for a reported size that is smaller than the fixed header. Breaking: Header implementors now provide total_size() instead of payload_len().
Make the RSDP constructors fill in the checksum fields themselves so callers do not have to pass them in, and keep the builder tests matched to that API change. Validation now uses fixed-size slices for RSDP v1 and rejects bogus v2 lengths before slicing, which removes the previous out-of-bounds read risk from checksum validation.
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