feat(corpus): add low-weight crossover mutators

[decofe]

Summary

• add low-weight crossover insert/replace corpus mutators using persisted corpus entries as donor transactions
• expose fuzz and invariant mutation weights for the new strategies
• update default mutation ratios so existing strategies remain equally weighted and crossover strategies run less often
• cover disk-backed insert/replace behavior and CLI config parsing

Prompted by: @0xalpharush

Tests

• cargo test -p foundry-evm invariant_crossover -- --nocapture
• cargo test -p forge --lib fuzz_and_invariant_config_flags -- --nocapture

Note: cargo test -p forge test_config_args -- --nocapture built successfully but then ran unrelated lint UI tests and failed with solc-0.8.35: Text file busy (os error 26).

[0xalpharush]

derek bench invariant

[github-actions]

cc @0xalpharush

bench (invariant) event published. Results will be reported separately. View publisher run

Config: subcommand: invariant, PR SHA: aa8771567ba1, compare-ref: master, timeout: 3600s, workers: default, benchmark-type: property

[stevencartavia]

code-wise lgtm, waiting for the benchmark

[mattsse]

LGTM

[figtracer]

lgtm

[mablr]

The benchmark categorized this as "regression", should we re-run when infra is fixed ? @grandizzy

[grandizzy]

The benchmark categorized this as "regression", should we re-run when infra is fixed ? @grandizzy

yes, let's wait on it

[grandizzy]

derek bench invariant

[github-actions]

cc @grandizzy

bench (invariant) event published. Results will be reported separately. View publisher run

Config: subcommand: invariant, PR SHA: 5999c96c4066, compare-ref: master, timeout: 3600s, workers: default, benchmark-type: property