Add LabAPI plugin dotnet new template

AGENTS.md

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+# AGENTS.md
+
+This repo is the source of a `dotnet new` template (shortName `labapi-plugin`) that
+scaffolds SCP: Secret Laboratory LabAPI plugins. This file follows the
+editor/vendor-agnostic [agents.md](https://agents.md) convention for AI coding tools
+other than Claude Code (Cursor, Codex, etc.). **`CLAUDE.md` is this repo's primary,
+detailed instructions file** — read it first if your tooling can. What follows is the
+condensed subset any agent needs, kept in sync with `CLAUDE.md`.
+
+## This is template source, not a plugin
+
+This section applies only while `.template.config/` is present next to this file —
+i.e. you're editing the template repo itself, not a plugin already generated from it.
+
+`.template.config/template.json` makes the dotnet templating engine do a **literal,
+repo-wide string replacement** at generation time (not semantic renaming): this
+folder's own name (`sourceName`) becomes whatever project name a consumer picks, the
+placeholder author name in `EntryPoint.cs` becomes their `--PluginAuthor`, and the
+LabAPI version pinned in the `.csproj`/`EntryPoint.cs` becomes their
+`--LabApiVersion`. See `template.json` for the exact current literals — don't repeat
+them verbatim in prose here, since this file ships inside every generated project and
+an exact match would get silently rewritten too. Don't introduce an exact match of
+one of those literals elsewhere in the repo unless you mean for it to be substituted;
+add a new `template.json` symbol instead of hardcoding a magic string. `EntryPoint`/
+`Config` (the class names) are intentionally **not** substituted — only the namespace
+tracks the project name.
+
+## Never invent LabAPI API surface
+
+Don't assume a LabAPI class/namespace/method/property/attribute exists. Verify it
+against the restored `Northwood.LabAPI` package (`LabApi.dll`/`LabApi.xml` under
+`%userprofile%\.nuget\packages\northwood.labapi\<version>\lib\net48\`) or
+https://github.com/northwood-studios/LabAPI first. If you can't verify a member,
+say so instead of guessing.
+
+## Toolchain choices — don't change without being asked
+
+`TargetFramework` is `netstandard2.1` on purpose (LabAPI itself only ships
+`net48`/`net481`), chosen so the plugin still loads under the game's Mono/.NET
+Framework 4.8 host. `LangVersion` is pinned to `14.0`. The `.csproj` suppresses
+exactly `NU1701` (scoped to the `Northwood.LabAPI` `PackageReference`) and `MSB3270`
+(via `ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch=None`) because of that
+netstandard2.1/net48-only-package combination — don't broaden either into a blanket
+suppression or remove them.
+
+## Code style and language
+
+No `//`, `/* */`, or `///` comments unless the user explicitly asks for them in that
+request; don't add comments restating self-explanatory code — `EntryPoint.cs`/
+`Config.cs` are already comment-free, follow the same standard for new files. All
+text embedded in code (log/console messages, exceptions, config descriptions,
+user-facing strings) defaults to English — e.g. `Logger.Info("Plugin initialized
+successfully")` — except identifiers the user requested (project name, namespace,
+class/method/property/variable names), which are never translated, and text the user
+explicitly asks to be in another language.
+
+## Verifying a change
+
+No automated tests exist. Verify by generating a real project and building it:
+
+```bash
+dotnet new uninstall . && dotnet new install .
+dotnet new labapi-plugin -n VerifyPlugin -o ../_verify/VerifyPlugin
+cd ../_verify/VerifyPlugin && dotnet build
+```
+
+Expect `Build succeeded. 0 Warning(s) 0 Error(s)`. See `CLAUDE.md` for the full
+verification notes (cache invalidation after editing `template.json`, Windows cleanup
+caveats).