v0.3.0

What's Changed

• feat(mcp): MCP server phase 1 — skeleton + core prerequisites by @HelgDemidov in #27
• feat(mcp): MCP server phase 2 — resources + prompts by @HelgDemidov in #28
• feat(mcp): MCP server phase 3 — HTTP + auth by @HelgDemidov in #29
• feat(mcp): phase 4 — convert_batch, per-item isolation, atomic admission, progress by @HelgDemidov in #30

Full Changelog: v0.2.0...v0.3.0