feat: Enhance Apollo removal analysis with AI insights on enum replacements and dependency validation

project-knowledge/02-work-items/pdiap-15838.md

@@ -57,6 +57,8 @@ tags:
 - Follow-up analysis suggested `XFlow.Slot` might be the only Apollo-generated production model still used outside the GraphQL-generated folder, but local trial changes surfaced additional Apollo-dependent models/build errors. Treat the `XFlow.Slot` simplification as a promising first step, not as a fully validated statement about the whole codebase.
 - The suggested simplification is to remove the current round-trip `stagedValues() -> [String: String] -> XFlow.Slot -> [String: String] -> XFlowUpdateSlotsRequest.slots` and instead pass `[String: String]` straight through to `XFlowUpdateSlotsRequest.slots`, keeping `SlotVariable: Encodable` in the REST model layer for request serialization.
 - The next AI follow-up should focus only on the first step and ask GitHub Copilot to corroborate residual Apollo-model dependencies by using `xcodebuild` failures, not just static reference search.
+- Follow-up enum validation indicates at least some Apollo-generated enum types can likely be replaced with native Swift `enum Name: String` definitions without preserving Apollo `EnumType` behavior. For the currently checked production callers, Copilot reported no Apollo-specific enum API dependency for `XFlow.ContentType`, `XFlow.ScreenshotFormat`, and `XFlow.NextTransitionType`; current behavior relies on `rawValue`, equality/switch use, and `init?(rawValue:)`-style parsing.
+- The currently observed fallback behavior is simple and code-local: unknown `ContentType` values are skipped by converter guards, unknown `ScreenshotFormat` values fall back to PDF in downstream callers, and unknown `NextTransitionType` values currently propagate as `nil` where the target property is optional.
 - Apollo source-level cleanup appears sequenced as: replace `XFlow.Slot` with a transport-agnostic model first, decouple `XFlowInitManager` from `NetworkClient` while preserving current REST endpoint behavior, then remove runtime GraphQL code, project wiring, Apollo-only tests/scripts/docs, and finally treat any transitive PicoSDK Apollo dependency as a separate dependency-exit task.
 - Apollo may still remain in the pod graph transitively through PicoSDK even after source-level cleanup, so "Apollo removed" should be framed carefully unless the dependency graph is also cleared.