chore(master): release 2.7.4 (#88)

chore: bump devDependencies

fix: include originalKey in parsed headers output

test: improve test coverage across codebase

refactor: simplify and clean up codebase

fix: preserve __esModule and .default in CJS build for bundler interop

fix: prevent RFC 2047 encoded-word address fabrication

test: update type check test with originalKey property

fix: add missing originalKey to Header type and Uint8Array to Attachment content

docs: add link to full documentation site

chore(master): release 2.7.3 (#87)

fix: correct TypeScript type definitions to match implementation

docs: update README to reflect Node.js support

test: add comprehensive test coverage for untested modules

chore(master): release 2.7.2 (#86)