Define armory-core integration strategy on top of RIMS

[fusion94]

Description

armory-core is one of the strongest candidates for eventually running on top of RIMS, but it contains domain-specific logic that should not be pushed into the framework.

This issue defines the integration strategy:

• what armory-core should inherit from RIMS
• what remains armory-core-specific
• what migration path makes sense
• what should happen only after RIMS is proven by additional domains

Acceptance Criteria

• Identify which armory-core capabilities map cleanly to RIMS core
• Identify which armory-core capabilities must remain domain-specific
• Define likely migration phases or layering approach
• Document risks of trying to migrate too much too early
• Ensure the strategy aligns with the RIMS boundary ADR
• Produce a written integration plan for future implementation