Minor repo enhancement

AGENTS.md

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+# Agent notes — Beat Saber / this repo
+
+## Repo
+
+- Modding workflow and references live in `docs/pc-modding.md` (Linux + Cursor + `dotnet` CLI; no VS/Rider BSMT extension).
+
+## Game install (BSManager)
+
+- **Path:** `/home/pleb/.local/share/BSManager/BSInstances/1.40.8`
+- **Version pin:** `1.40.8` (managed copy; launch modded build from BSManager, not Steam’s live folder).
+- **BSIPA:** Present (`IPA/`, `IPA.exe`, `winhttp.dll`, `Plugins/`).
+
+## Plugins currently in `Plugins/`
+
+BeatSaverDownloader, BeatSaverUpdater, BSML, BS_Utils, PlaylistManager, SiraUtil, SongCore (+ manifests/libs as shipped).
+
+## Host toolchain
+
+- **dotnet:** `9.0.312` (SDK 6+ is fine for `net472` plugin builds per guide).
+- **ilspycmd:** `9.1.0.0` (decompile/reference game or plugin assemblies from CLI).
+- **NuGet:** Installed (per user setup).
+
+## Conventions agents should respect
+
+- Plugin projects are **.NET Framework 4.7.2** class libraries loaded by BSIPA; builds are **CIL** — Linux `dotnet build` output is valid for the Proton game instance.
+- Point `BeatSaberDir` / game references at the BSManager instance path above when editing project user files or HintPaths.