Add cargo-fuzz / libFuzzer coverage-guided mode.

[codeZe-us]

Random mutation finds shallow bugs; coverage guidance finds deep ones. Adding a libFuzzer target lets the tool explore parser branches the random loop would rarely reach.

Issues/what to fix

• Add a fuzz/ directory with a cargo-fuzz target fuzz_targets/parse.rs calling prism-core on arbitrary bytes.
• Seed the corpus with the valid-address generator output from Task 2.2.
• Document cargo fuzz run parse in the README as the deep-fuzz entry point.

Files location

fuzz/Cargo.toml, fuzz/fuzz_targets/parse.rs

Expected result

cargo fuzz run parse executes coverage-guided fuzzing over the real parser.

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