v0.9.12

🚀 Hashline v0.9.12 — MCP Auto-Agent Adoption

MCP instructions field now returned in initialize response (fixes #107).
AI agents (Claude, Codex, Cursor, etc.) can auto-discover Hashline as an MCP server — no manual AGENTS.md needed.

What changed

• instructions field in MCP initialize response for seamless agent onboarding
• Code formatted via cargo fmt

Verified

• ✅ CI passing — all checks green on this release

Upgrade: cargo install hashline --version 0.9.12

Full Changelog: v0.9.11...v0.9.12