chore(release): prepare TypeChain 0.2.4

[sjungwon03]

Summary

• bump the package and lockfile to 0.2.4
• update active documentation and release contract fixtures to the patch version
• retain the reviewed TypeMCP 0.4.0 and dependency updates already merged to dev

Verification

• npm run verify:publish
• npm audit --omit=dev (0 vulnerabilities)
• git diff --check

Closes #137

[sjungwon03-ai]

The 0.2.4 package metadata, lockfile, documentation, and release-contract expectations are internally consistent. Required checks completed successfully on this exact head.