Split AGENTS.md into area guides so Codex reads it in full again (#1046)

app/MindWork AI Studio/Tools/Databases/AGENTS.md

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+# AGENTS.md
+
+These instructions cover the databases in `app/MindWork AI Studio/Tools/Databases/`. They add to the
+`AGENTS.md` in the repository root, which applies here as well.
+
+## Databases
+
+Local RAG runs on two databases, addressed through `DatabaseRole`:
+
+- **`VECTOR_STORE`** — Qdrant Edge through the `qdrant-edge` crate, running **in-process inside the
+  Rust runtime**. There is no sidecar process, no port 6333 and no Qdrant API key; .NET reaches it
+  over the internal runtime API (`/system/qdrant-edge/*`, see `runtime/src/qdrant_edge_database.rs`),
+  secured by the same TLS and API token as every other runtime call. One store per data source,
+  named `rag_<data source guid>`, holding a single named vector `embedding` per point.
+- **`INDEX_STORE`** — SQLite at `<data directory>/databases/sqlite/rag-index.sqlite3`, reached
+  through EF Core. It holds the data sources, the file fingerprints, the chunk texts and an FTS5
+  index over them, plus the files which permanently failed to index.
+
+When working on these, keep in mind:
+
+- **`GetDisplayInfo()` feeds the information page.** A new diagnostic value belongs in the client
+  that knows it, not in `Pages/Information.razor.cs`. The page renders whatever label-value pairs it
+  receives and stays free of per-database knowledge.
+- **Let every probe in `GetDisplayInfo()` catch its own failure.** When the method throws, the page
+  replaces the *entire* block with the fallback client, so one unreadable value costs all the others
+  as well.
+- **Raw SQL against SQLite goes through `context.Database.GetDbConnection()`**, not through
+  `SqlQueryRaw<T>`: that one expects a column named `Value` and wraps the statement, so a `PRAGMA`
+  never works with it.
+- **A new EF Core migration needs a `[DynamicDependency]`** in `IndexStoreSchemaMigrator`, because
+  `PublishTrimmed` is on and the migration type would otherwise be trimmed away. The "Schema version"
+  line on the information page shows the applied and pending counts, so a forgotten entry becomes
+  visible there.

app/MindWork AI Studio/Tools/Databases/CLAUDE.md

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+@AGENTS.md