Build multi-platform CI, prebuild packaging, provenance, and release automation

[kylebernhardy]

Outcome

Publish reproducible Node native packages using HarperFast hnsw and Symphony conventions where applicable.

Acceptance criteria

• CI covers supported Node versions and Linux glibc/musl x64/arm64, macOS x64/arm64, and Windows x64 targets.
• Rust tests, Node tests, native smoke tests, Rocks compatibility tests, lint, formatting, and package-content checks gate merges.
• Platform packages are assembled without bundling a second RocksDB into the Rocks entry point.
• npm releases include provenance, consistent Apache-2.0 metadata, changelog/release notes, and install smoke tests.
• A compatibility manifest records the qualified Tantivy, fulltext ABI, rocksdb-js ABI, Node-API, and platform combination.
• Release rollback and unsupported-platform errors are documented and actionable.

Comment generated by kAIle (Codex GPT-5)