fix: bundle macos on npm publish

[Alexgodoroja]

Pull Request

Summary

Fix rpm

Changes

Files changed

File: sdk/node/scripts/build-binaries.sh
What: Outputs to bin/${OS}-${ARCH}/ (subdir) instead of flat bin/; .pilot-version stays

at bin/ root (shared across platforms)                                             

────────────────────────────────────────
File: sdk/node/src/runtime.ts
What: New pkgBinRoot() (top-level bin/) + pkgBinDir() (platform subdir);
bundledVersion() reads from root; platformDirName() helper
────────────────────────────────────────
File: sdk/node/src/ffi.ts
What: findLibrary() fallback for npm package layout now looks in bin/-/
────────────────────────────────────────
File: sdk/node/tests/runtime.test.ts
What: Test fixture builds proper layout (root + platform subdir + version marker); +1
new test for missing-platform-subdir case
────────────────────────────────────────
File: .github/workflows/publish-node-sdk.yml
What: Adds workflow_dispatch (inputs: version, prerelease); each matrix runner uploads
its bin/ subdir as node-bin-{linux,macos}; publish job downloads both, merges macOS
subdirs into Linux package base, then publishes one multi-platform npm package
────────────────────────────────────────
File: .github/workflows/publish-python-sdk.yml
What: Adds workflow_dispatch (same inputs); gating moved from test-sdk to publish so
dispatch can do "build only" for prereleases

Verification done

• npm test in sdk/node: 112/112 pass (was 111, +1 new wrong-platform test)
• pytest in sdk/python: 124/124 pass (modulo the unrelated pre-existing /private/var
  symlink failure)
• bash sdk/node/scripts/build-binaries.sh produces
  sdk/node/bin/darwin-arm64/{pilot-daemon, pilotctl, pilot-gateway, pilot-updater,
  libpilot.dylib} + sdk/node/bin/.pilot-version
• findLibrary() resolves correctly through the seeder end-to-end (verified with node
  -e)
• YAML syntax validates for both workflow files
• grep -ri polo sdk/ returns nothing (PR fix: update python and js pilot clients to 1.9-* #90 already on main)