Engram v1.2.1 — 100% Coverage & Contributor Standards

Reaches 100% test coverage across the entire codebase and establishes formal standards for AI-assisted contribution.

What Changed

• 100% Test Coverage: Every package (cmd, store, server, tui, setup) is now fully covered by automated tests.
• Contributor Skills: Added a skills/ directory with formal AI skills for TDD, SDD, PR workflow, and commit hygiene.
• Workflow Standards: Added CONTRIBUTING.md establishing an issue-first workflow and PR guardrails.
• Docs Alignment: Updated README and setup scripts to reflect the new skills architecture and cross-agent support.

Full Changelog: v1.2.0...v1.2.1