docs: describe the payment check first and its trust boundary

[gabchess]

What changed

The root README describes the payment check first, runs it first, and links the changelog. THREAT-MODEL.md gains a section on the payment check's boundary: what the caller controls, what the owner controls, what consult() reads. CONTRIBUTING.md and SECURITY.md name the consult/, mcp/ and augment/ surfaces. The agent skill, the catalog reference and the server README name the authorization window and policyFields.

How it is tested

yarn public:check, yarn evals:offline, yarn evals:test, yarn augment:verify and yarn lint pass.

Summary by CodeRabbit

• Documentation
  • Updated repository documentation to describe Hedwig’s payment-check service, MCP server, and onchain role program.
  • Added setup and verification commands for Consult, MCP, and Augment.
  • Clarified security scope, deployment authority, and Consult’s caller responsibilities.
  • Expanded Augment documentation with an additional evaluation scenario.
  • Documented required payment policy fields, including Solana role selection and authorization windows.
  • Clarified policy validation and outcomes for incomplete payment policies.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7d569c3 and aa53800.

📒 Files selected for processing (8)

• CONTRIBUTING.md
• README.md
• SECURITY.md
• THREAT-MODEL.md
• augment/README.md
• augment/skills/hedwig/SKILL.md
• augment/skills/hedwig/references/conditions.md
• mcp/README.md

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