Implement discovery artifact generators on capabilities page

[GsCommand]

Goal

Add three more local build-plan generators to public/capabilities.html:

1. Copy agent card JSON
2. Copy ENS TXT records
3. Copy MCP/OpenAPI surface draft

Current state

/capabilities.html already supports:

• Add to build plan
• Clear plan
• Export manifest
• Copy manifest JSON
• Copy SDK config
• Download Trust & Verification manifest

Required UI additions

In the Build Plan panel add buttons:

• Copy agent card
• Copy ENS records
• Copy MCP surface

Required JS additions

Add helper functions:

agentCard()

Returns JSON with:

• type: commandlayer.agent_card
• version: 0.1.0
• name: your-agent.eth
• capabilities: selected capability ids
• verifier: /api/verify
• proof_url_pattern: /verify/r/{receipt_id}
• sdk: @commandlayer/agent-sdk
• generated_at timestamp

ensRecords()

Returns plain text:

cl.capabilities=trust-verification,ai-intelligence
cl.verifier=https://www.commandlayer.org/api/verify
cl.proof_url=https://www.commandlayer.org/verify/r/{receipt_id}
cl.sdk=@commandlayer/agent-sdk
cl.receipt.signer=your-agent.eth
cl.sig.canonical=json.sorted_keys.v1
cl.sig.hash=sha256
cl.sig.alg=ed25519

discoverySurface()

Returns JSON with:

• type: commandlayer.discovery_surface_draft
• version: 0.1.0
• capabilities: selected capability ids
• tools: one draft tool per selected capability group
• verification_endpoint: /api/verify
• note: Draft only. Publish through MCP/OpenAPI after implementation.

Constraints

• Static only. No backend.
• No fake live claims.
• Empty build plan should still copy useful placeholder output or prompt the user.
• Preserve existing page behavior.

Acceptance checks

• New buttons appear in the Build Plan panel.
• Agent card JSON copies.
• ENS TXT records copy.
• MCP/OpenAPI draft copies.
• Existing export/copy SDK config buttons still work.
• No console errors.