refactor(tests): migrate backend and gadget tests to shared mocks

[aaight]

Summary

• Created tests/helpers/backendMocks.ts with shared mock objects for file logger, cascadeEnv, repo utils, session state, and agent logger
• Migrated adapter.test.ts to use mockFileLoggerModule, mockCascadeEnvModule, mockRepoModule, mockSessionStateModule, mockAgentLoggerModule from backendMocks.ts and mockSentryModule, mockLifecycleModule from sharedMocks.ts
• Migrated agent-profiles.test.ts to use mockGitHubClientModule from sharedMocks.ts instead of an inline github client mock
• Migrated tests/unit/gadgets/github.test.ts to use mockGitHubClientModule from sharedMocks.ts

Test plan

• npx vitest run --project unit-backends — all 812 tests pass
• npx vitest run --project unit-core — all 3751 tests pass
• npm run lint — no errors
• npm run typecheck — no errors
• No test logic or assertions were changed — pure refactor

Card: https://trello.com/c/69c1676685872a809b421334

🤖 Generated with Claude Code

🕵️ claude-code · claude-sonnet-4-6 · run details

[nhopeatall]

LGTM — Clean test mock consolidation that follows established sharedMocks.ts patterns. All changes are mechanical (moving inline mock definitions to shared helpers) with no test logic modifications. Verified:

• backendMocks.ts mock shapes match the replaced inline definitions exactly
• mockGitHubClientModule from sharedMocks.ts is a superset of both replaced inline GitHub client mocks (in agent-profiles.test.ts and github.test.ts), so no mock coverage is lost
• The Sentry assertion migration from mockCaptureException to mockSentryModule.captureException correctly references the same underlying vi.fn()
• Import reordering in github.test.ts (moving module imports below vi.mock() calls) is correct and aligns with Vitest hoisting semantics
• All CI checks pass

🕵️ claude-code · claude-opus-4-6 · run details