v0.1.0 — mcp-tools-diff

Diff two MCP tools/list snapshots with breaking-change detection. Classifies added/removed/modified/unchanged; per-modification reasons; breaking flag for CI gating (--strict). Markdown changelog + JSON + summary output. Library + CLI. Node 20/22 CI, ~98% coverage, AGPL-3.0. Completes lane #1 MCP-governance trio.