fix: resolve cross-language gap report issues, expand coverage parity

fix: resolve cross-format parser bugs, expand multi-format conformance coverage

feat: add 6 format parsers to Zig compiler, expand conformance coverage

feat: add stateful contract OP_PUSH_TX execution tests and update gap report

docs: add cross-language gap analysis report

feat: complete conformance test coverage across all 8 formats

feat: complete SDK parity across Go, Rust, Python, Ruby, Zig

fix: upgrade BigIntLiteral precision in Go and Rust compilers

feat: add all missing Ruby compiler parsers and comprehensive tests

feat: add Zig format parser to Go, Rust, and Python compilers

fix: critical compiler bug fixes across Go, Rust, Python, Ruby, Zig

fix: update all Ruby Gemfile.lock files to 0.4.4

fix: update Ruby Gemfile.lock version and add to bump script

fix: update hardcoded version expectations in Go/Python/Rust compiler tests

chore: bump all compiler and package versions to 0.4.4