Create capability detail pages for Trust & Verification verbs

[GsCommand]

Goal

Create the first capability detail pages under /capabilities/*.

Initial pages

• /capabilities/verify.html
• /capabilities/authenticate.html
• /capabilities/authorize.html
• /capabilities/attest.html

Purpose

Each capability page should explain:

• what the capability means
• request schema
• receipt schema
• valid example
• tampered example
• verifier support
• ENS namespace
• SDK usage
• discovery model

Layout

Use the same shared visual system as:

• homepage
• capabilities page
• verifier page

Suggested sections

1. Hero
2. Capability definition
3. Request flow
4. Receipt example
5. Verification flow
6. Discovery records
7. SDK usage
8. Related capabilities

Constraints

• Do not invent schema links that do not exist.
• If schema/example files already exist in repo, link to them.
• If not, use placeholder cards with "coming soon".
• Do not change verifier logic.

Acceptance checks

• /capabilities/verify.html exists.
• Shared nav works.
• Capability pages feel like protocol documentation, not blog posts.
• Trust & Verification capabilities are visibly the active v1 set.