# Systems Index

## Core Components

- [fid4.md](./fid4.md)
  Consumer app and the most important real-world validation environment.

- [xflowsdk.md](./xflowsdk.md)
  Backend-driven flow engine and the center of most Fidelity behavior analysis.

- [xflowviewmaker.md](./xflowviewmaker.md)
  Adapter layer historically involved in version bumps, release coupling, and removal evaluation.

- [ftframeworks.md](./ftframeworks.md)
  Consumer-side feature modules that often mediate whether XFlow changes can be validated in Fid4.

- [cogstore.md](./cogstore.md)
  Flow-configuration publishing and version-comparison platform used to verify what is live in QA/Production.

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## Guidance

- Start with `xflowsdk.md` for backend-driven behavior questions.
- Start with `fid4.md` or `ftframeworks.md` for consumer validation and release flow questions.
- Open `xflowviewmaker.md` when the question involves version bumps, transitional architecture, or pipeline friction.
- Open `cogstore.md` when the question involves published flow-definition versions, config diffs, or whether a service/config change is live in QA vs Production.