Reframe the project around Skill evolution

[hanzw]

What changed

• reframe the public product around native Agent Skill lifecycle management;
• replace the infrastructure-shaped agent-runtime Skill with the action-shaped evolve-skills Skill;
• distinguish Agent Skill Evolution from Google ADK and Viktor's fictional “Glorious Evolution”;
• replace the old runtime banner with original discover/test/evolve/remove artwork;
• retain Hook, ReMe, policy, installation, and rollback code as an optional support implementation.

Why

Runtime is an implementation layer, not the standard unit of reusable agent capability. Native Skills are the correct public abstraction, while ADK, task state, memory, and authorization remain separate concerns.

Impact

Existing v2.0.0 users install evolve-skills, then remove the retired agent-runtime Skill. Internal package names and launchd labels remain stable during v2 for compatibility.

Validation

• 40 Python tests pass;
• all three Skill folders pass quick_validate.py;
• native skills discovery finds exactly three Skills;
• Promptfoo configuration validates;
• no local paths, credentials, or personal project names are present.

Rollback

Revert commit 403ae43; existing v2.0.0 runtime release and service labels remain unchanged.