fix(release): support npm and native version lookup

[halfaipg]

Summary

• use compile-time version embedding for standalone Bun binaries
• keep filesystem package metadata lookup for npm/Node installs
• inject the version into all binary build targets
• prepare v2.0.0-pre.86

Verification

• npm run check (1,307 tests)
• npm run build
• packed tarball installed into a clean prefix and executed under Node
• native darwin-arm64 binary compiled with release define and executed
• both artifacts report 2.0.0-pre.86 and pass --help