feat: label delegate public key as Agent ID and document it

[UyLeQuoc]

Summary

Make the delegate public key easy to find and collect as the Agent ID (MEMWAL_AGENT_ID).

Changes

• Dashboard: label the delegate public key as Agent ID (Delegate keys table column and SDK credentials row), with a "What is this?" link to docs. Existing copy buttons copy the full key.
• Docs: add a "Find Your Agent ID" guide covering the dashboard, the MCP credentials file, and the SDK; wire it into nav and link it from Quick Start.

Notes

• Agent ID is the delegate public key, stamped on-chain as memwal_agent_id on every memory blob.

[jessiemongeon1]

Style Guide Audit

Audited 2 file(s) against the Sui Documentation Style Guide.

2 violation(s) found. All must be fixed before merge.

docs/getting-started/find-your-agent-id.md (2 violation(s))

2 violation(s) (2 regex, 0 claude)

• Line 13 — "on-chain" is one word → "onchain"
  • Current: on-chain
  • Fix: onchain
• Line 62 — "on-chain" is one word → "onchain"
  • Current: on-chain
  • Fix: onchain

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Automated audit using the Sui Documentation Style Guide.