Separate VerifyAgent from agent-cards (remove product/demo artifacts & update docs)

[GsCommand]

Motivation

• Remove VerifyAgent product/demo/verifier artifacts so the repository represents Agent Cards only (identity, capabilities, endpoints, verbs, and signer/receipt metadata references).
• Treat VerifyAgent as an external, standalone public verifier (link to the new repo) rather than an in-repo product or demo.
• Update manifests, validation, and documentation to reflect the separation and keep canonical Agent Cards surfaces focused and accurate.

Description

• Deleted the VerifyAgent card artifacts from canonical and archival card trees: agents/v1.0.0/commercial/verifyagent.eth.json, agents/v1.1.0/commercial/verifyagent.eth.json, and the derived dist-pin/agent-cards/v1.1.0/agents/v1.1.0/commercial/verifyagent.eth.json.
• Updated registry/manifests and derivative bundle: changed meta/manifest.json and dist-pin/*/meta/manifest.json to remove the verifyagent.eth entry and adjusted bindings.commercial.count from 5 to 4, and rebuilt the dist-pin/agent-cards/v1.1.0/ bundle.
• Adjusted validation expectations by removing the verify verb from the authoritative in-repo commercial set in scripts/validate-cards.mjs.
• Updated supporting documentation and release notes to treat VerifyAgent as an external verifier and clarify architecture responsibilities, including edits to README.md, SPEC.md, ONBOARDING.md, CHANGELOG.md (added an Unreleased entry), SECURITY_PROVENANCE.md, and RESOLUTION.md.
• Regenerated checksums and updated checksums.txt and dist-pin/agent-cards/v1.1.0/checksums.txt to reflect removed files; retained all signer/verification metadata schema surfaces and only removed product/demo artifacts.

Testing

• Rebuilt derivative bundle with npm run generate:dist-pin and regenerated checksums with node scripts/generate-checksums.mjs, both completed successfully.
• Ran local validation with npm run validate which completed successfully (Current checks and checksum verification passed).
• Attempted full release validation with npm run validate:release; structural checks succeeded but external schema resolution failed in this environment due to network unreachable (ENETUNREACH), so external URL resolution could not be completed here.

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Codex Task