Agent manifest: export const agent + object tools + slash rule

[a6b8]

Agent manifest restructuring

Context: Memo 001-agent-spec-docs-restructuring. Agents now use export const agent (not main) and declare tools/prompts/resources as objects with slash rule.

Changes:

• export const main → export const agent in all agent contexts
• tools from array to object (slash keys = external null, no-slash = inline)
• Slash rule for prompts and resources (external references)
• Skills: no slash keys (model-specific, inline-only)
• New validation rules AGT019, AGT020
• Updated 06-agents.md, 00-overview.md, 08-migration.md, 15-catalog.md, llms.txt
• Updated manifest.json example

Affected files:

• spec/v3.0.0/06-agents.md
• spec/v3.0.0/00-overview.md
• spec/v3.0.0/08-migration.md
• spec/v3.0.0/15-catalog.md
• spec/v3.0.0/llms.txt
• examples/v3.0.0/agents/crypto-research/manifest.json