feat: Add Cogstore documentation and update references in project context and debugging guidelines

ai/context/systems/cogstore.md

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+# Cogstore
+
+## Role
+
+Cogstore is an important Fidelity platform used to manage and publish many flow configuration definitions, each with its own independent version history.
+
+---
+
+## Confirmed Context
+
+- In the Fidelity flow-config workflow, Cogstore is used to modify and publish individual flow definitions.
+- Cogstore tracks versions per flow definition rather than as one single platform-wide version.
+- Cogstore can be used to compare changes between flow-definition versions, similar to a Git-style diff.
+- Cogstore can be used to check which version of a specific flow definition is published in environments such as QA and Production, including who published it and when.
+- On April 16, 2026, David used Cogstore to confirm that the relevant flow-definition change tied to Rashmi's service-side update was present in QA as version `0.0.142`, while Production was still on `0.0.133`.
+
+---
+
+## Related Context
+
+- Jeff indicated on April 15, 2026 that Slate had been used by newer consumer services during the SwiftUI refactor, but is now believed to be decommissioned.
+- Because service/configuration changes can be environment-specific and versioned per flow, Cogstore should be checked before concluding that a payload/config change is live in Production.
+- Flow IDs are not guaranteed to exist in both Cogstore and Slate. When tracing a specific flow definition, confirm which configuration system actually owns that flow instead of assuming the same ID will appear in both places.