fix: block Node 24 WASM crash path

[zaidazmi]

Summary

• block Node.js 24+ before CodeGraph starts tree-sitter WASM grammar compilation
• reuse the compatibility check for both CLI startup and library init/open paths
• narrow package engine metadata and README guidance to supported Node 18/20/22
• add unit coverage for version parsing, unsafe-runtime blocking, override behavior, and the recovery banner

Repro

On Node v24.13.0, before this fix, the extraction suite crashed during grammar compilation with Fatal process out of memory: Zone. Node v20.19.4 completes the same extraction suite successfully.

Test plan

• npx vitest run __tests__/node-version-check.test.ts
• npm run build
• node dist/bin/codegraph.js --version on Node v24.13.0 exits with the unsupported-runtime banner
• CODEGRAPH_ALLOW_UNSAFE_NODE=1 node dist/bin/codegraph.js --version on Node v24.13.0 prints the banner and version
• direct library construction on Node v24.13.0 throws the unsupported-runtime banner before grammar compilation
• PATH="/Users/zaidazmi/.nvm/versions/node/v20.19.4/bin:/Users/zaidazmi/.codex/tmp/arg0/codex-arg0N0CH7a:/Users/zaidazmi/.bun/bin:/Users/zaidazmi/.antigravity/antigravity/bin:/Users/zaidazmi/.opencode/bin:/Users/zaidazmi/.nvm/versions/node/v24.13.0/bin:/Users/zaidazmi/.rbenv/shims:/Users/zaidazmi/.local/pipx/venvs/pip/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Users/zaidazmi/.rbenv/shims:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/pkg/env/active/bin:/opt/pmk/env/global/bin:/Library/Apple/usr/bin:/usr/local/share/dotnet:~/.dotnet/tools:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Users/zaidazmi/.cargo/bin:/Users/zaidazmi/.local/bin:/Users/zaidazmi/Library/Android/sdk/emulator:/Users/zaidazmi/Library/Android/sdk/platform-tools:/Users/zaidazmi/.local/bin:/opt/homebrew/opt/fzf/bin:/Users/zaidazmi/.lmstudio/bin:/Applications/Codex.app/Contents/Resources" npm run build
• PATH="/Users/zaidazmi/.nvm/versions/node/v20.19.4/bin:/Users/zaidazmi/.codex/tmp/arg0/codex-arg0N0CH7a:/Users/zaidazmi/.bun/bin:/Users/zaidazmi/.antigravity/antigravity/bin:/Users/zaidazmi/.opencode/bin:/Users/zaidazmi/.nvm/versions/node/v24.13.0/bin:/Users/zaidazmi/.rbenv/shims:/Users/zaidazmi/.local/pipx/venvs/pip/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Users/zaidazmi/.rbenv/shims:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/pkg/env/active/bin:/opt/pmk/env/global/bin:/Library/Apple/usr/bin:/usr/local/share/dotnet:~/.dotnet/tools:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/Users/zaidazmi/.cargo/bin:/Users/zaidazmi/.local/bin:/Users/zaidazmi/Library/Android/sdk/emulator:/Users/zaidazmi/Library/Android/sdk/platform-tools:/Users/zaidazmi/.local/bin:/opt/homebrew/opt/fzf/bin:/Users/zaidazmi/.lmstudio/bin:/Applications/Codex.app/Contents/Resources" npm test