feat(agents): use block scalar for description to fix YAML parsing

[Dragboyz]

Improve agent YAML clarity and consistency

• Convert long inline description to block scalar to prevent YAML parsing errors with colons/quotes/tags.
• Standardize “Base Account” capitalization for consistency.
• Clarify Zora wording to reflect protocol integrations with standard wallet connections.
• Remove duplication in Zora section.

Files changed:
base-account/agent-spend-permissions/.claude/agents/blockchain-wallet-engineer.md
base-account/agent-spend-permissions/.claude/agents/code-clarity-reviewer.md
base-account/agent-spend-permissions/.claude/agents/futuristic-ui-designer.md

Why:

• Fixes “mapping values are not allowed in this context” parsing issues.
• Improves technical accuracy and keeps docs consistent with repo terminology.

References:

• Upstream files in base/demos: blockchain-wallet-engineer.md, code-clarity-reviewer.md, futuristic-ui-designer.md
• my PR context: Fix YAML front‑matter parsing in agent definitions #71