Add tvc-demo-builder skill for solutions engineering

[natefikru]

Summary

• Adds a distributable Claude Code skill (skills/tvc-demo-builder/) that teaches Claude how to build TVC enclave demo applications on this template
• Covers the full demo lifecycle: project setup, endpoint implementation, testing, container builds, and TVC deployment
• Includes reference docs for template architecture, five concrete demo implementations, and a testing guide
• Structured as a phased workflow following the Agent Skills open standard

What the skill enables

Solutions engineers can say things like:

• "Create a price oracle demo for a DeFi client"
• "Build a compliance check endpoint for our JP Morgan meeting"
• "Write e2e tests for the auction demo"
• "Deploy this to TVC"

Claude loads the skill and knows the template structure, safety rules (no unwrap/panic), testing patterns (unit + e2e), dependency management, and deployment pipeline without the SE needing to explain any of it.

Skill structure

skills/tvc-demo-builder/
  SKILL.md                           # Main instructions (5 phases)
  references/
    template-architecture.md         # Deep project structure reference
    demo-examples.md                 # 5 demo implementations (oracle, settlement, signer, compliance, auction)
    testing-guide.md                 # Unit, e2e, and manual testing patterns
  evals/
    triggers.json                    # 15 should-trigger, 8 should-not-trigger queries
    evals.json                       # 6 functional evaluation scenarios

Test plan

• Verify skill triggers correctly: ask Claude "create a new TVC demo" in the tvc-template repo
• Verify skill does not trigger for unrelated queries: ask "create a Turnkey wallet"
• Test a full demo build: ask Claude to create a price oracle and verify it compiles, tests pass, and lints clean
• Verify the skill works when distributed outside the repo (copy to ~/.claude/skills/)