v0.2.0 — Scalability + Open-Source Readiness

Scalability

• Memory-mapped vector storage (MmapVectors). Replaces Vec<Vec<f32>> with a flat mmap-backed file. Zero-copy reads, append-only writes, near-zero RSS for vector data regardless of dataset size.
• Disk-backed chunk metadata (ChunkStore). Backed by redb (pure Rust embedded DB). Replaces in-memory HashMap<u64, DocumentChunk>.
• Incremental HNSW indexing. Ingest path loads existing USearch index via .load(), appends with .add(), saves — no more full rebuild on every ingest.
• New dependencies: memmap2, bytemuck, redb

Telemetry

• Anonymous opt-out telemetry via PostHog. Sends daily heartbeat with instance UUID, version, OS, arch, collection count, total vectors. No data content or PII.
• Opt out: COMPASS_TELEMETRY=off or DO_NOT_TRACK=1
• Python examples (examples/python/compass_client.py) covering all API interactions.

Open-Source Readiness

• CODE_OF_CONDUCT.md (Contributor Covenant v2.1)
• SECURITY.md (vulnerability disclosure policy)
• .github/ISSUE_TEMPLATE/ (bug report, feature request)
• .github/PULL_REQUEST_TEMPLATE.md
• .github/CODEOWNERS
• .github/workflows/release.yml (automated releases on tag push)
• docker-compose.yml (local quickstart)
• README badges (CI, license, Rust version)
• Compass logo + Captain wordmark in README header

Changed

• MSRV bumped to 1.88 (from 1.82). Required by time@0.3.47.
• Dockerfile upgraded to rust:latest + debian:trixie-slim.