refactor(db): split settingsRepository god-module into 5 focused repositories

[aaight]

Summary

• Split settingsRepository.ts (441 lines, 25 functions, 6 domains, 24 consumers) into 5 focused single-responsibility modules
• Converted original file to a barrel re-export for zero-breaking-change backward compatibility
• Added 5 domain-specific test files mirroring the new module boundaries

What was refactored

New Module	Functions Extracted	Domain
organizationsRepository.ts	getOrganization, updateOrganization, listAllOrganizations	Organizations
cascadeDefaultsRepository.ts	getCascadeDefaults, upsertCascadeDefaults	Cascade Defaults
projectsRepository.ts	listProjectsFull, getProjectFull, createProject, updateProject, deleteProject	Projects
integrationsRepository.ts	10 functions: all *ProjectIntegration*, getAllProjectIdsWith*Integration, plus *IntegrationCredential*	Integrations + Credentials
agentConfigsRepository.ts	listAgentConfigs, createAgentConfig, updateAgentConfig, deleteAgentConfig, getMaxConcurrency + maxConcurrencyCache	Agent Configs

settingsRepository.ts is now a barrel re-export — all 24 existing consumer files continue to work unchanged.

Test plan

• npm run typecheck — zero errors
• npm run lint — zero errors
• npm test — 239 test files, 3988 tests, all passing
• 5 new domain-specific test files added: organizationsRepository.test.ts, cascadeDefaultsRepository.test.ts, projectsRepository.test.ts, integrationsRepository.test.ts, agentConfigsRepository.test.ts
• Original settingsRepository.test.ts still passes unchanged (via barrel re-export)

Card

https://trello.com/c/69abe1d42301a258bc6fa949

🤖 Generated with Claude Code

[nhopeatall]

Summary

Clean refactoring that splits a 441-line god-module into 5 focused, single-responsibility repository modules with a barrel re-export for full backward compatibility. No issues found.

Verified:

• Code was extracted verbatim — no logic changes during the split
• All 25 exported functions have unique names across the 5 modules (no export * collisions)
• All 24 existing consumer files import from settingsRepository.js and continue to work unchanged via the barrel
• 5 new domain-specific test files cover the new modules; original settingsRepository.test.ts still passes through the barrel
• CI: lint, typecheck, unit tests, and integration tests all pass
• Module boundaries are well-chosen: Organizations, Cascade Defaults, Projects, Integrations+Credentials, Agent Configs