v0.1.0

First pre-release. Spec v0.1-draft — names, fields and wording may change.

• DECISIONS.md format spec (SPEC.md) with protocol header, entry schema, status machine
• decision-records skill: record / consult / review / promote workflows
• Install: npx skills add mc856/decision-records, Claude Code plugin marketplace, or drop decision-records.skill into a Cowork chat