chore(release): prepare 0.4.0

[JimmyDaddy]

Summary

• bump the package version from 0.3.0 to 0.4.0
• document the new cross-platform patch inspection and verification APIs
• include the Binary Patch Toolkit, large-file baselines, and site/README improvements in the release notes
• make the native fuzz harness select the correct feature-test macro on macOS

Why

PR #42 added consumer-facing inspectPatch() and verifyPatch() APIs for Android, iOS, and Web. npm still serves 0.3.0, so a minor release is required to make those capabilities available to consumers.

The release gate also exposed that the fuzz harness always selected the POSIX feature-test macro. On macOS that hides renamex_np and RENAME_EXCL; the harness now follows the same Darwin-specific setup as the native operation tests.

Impact

This is a backward-compatible minor release. Existing diff(), patch(), startDiff(), and startPatch() consumers are unchanged.

Publishing the resulting GitHub Release will trigger npm Trusted Publishing with provenance.

Validation

• yarn install --immutable
• yarn prepare
• yarn typecheck
• yarn lint
• yarn test --runInBand
• yarn test:native-operations
• FUZZ_RUNS=2000 yarn test:fuzz
• yarn test:web
• yarn test:web:browser
• yarn test:web:metro
• yarn test:package
• yarn site:build
• yarn site:test
• yarn site:test:browser
• npm pack --dry-run --ignore-scripts
• git diff --check