quality(registry): reduce code duplication in ModuleRegistry

[Snider]

Parent audit: #41

Finding

ModuleRegistry contains duplicated code patterns for registering and resolving different module types, increasing maintenance burden and inconsistency risk.

Fix

Extract common registration/resolution logic into shared methods or a base registry class. Use a strategy or template method pattern to handle type-specific differences.

Acceptance Criteria

• Common registration logic extracted to shared method
• Common resolution logic extracted to shared method
• Type-specific behaviour handled via strategy/template pattern
• Code duplication reduced by at least 30%
• All existing tests pass without modification
• No behavioural changes

[Snider]

Parent: #109