feat: stage 0, an empty RunicNPC that releases through CI

The repository RunicNPC is built in (docs/runicnpc/PLAN.md §9, stage 0):

- plugin/RunicNPC.cs: `// Requires: Kits` (D217), `[Info]` with the 0.0.0
  placeholder the release stamps, `RunicNpc_ApiVersion()` (API 1), and
  `rnpc.status`, which reports the version and which hooks have fired. It
  spawns nothing.
- plugin.toml: the API version, the framework floors it was loaded on
  (Oxide 2.0.7726, Carbon 2.0.259) and requires_plugins = ["Kits"].
- scripts/checkPlugin.js, adapted from Rust-Plugins': every hook listed and
  void unless written down; chat-command signatures; every RunicNpc_ call
  reachable by Call (the HumanNPC trap, PLAN.md §1.2); ApiVersion,
  `// Requires:` and [Info] agreeing with plugin.toml. 23 self-tests, including
  the real plugin and a CRLF checkout.
- PR Checks on PRs into main and edge; the release workflow on main, with
  Rust-Plugins' release engine unchanged and an adapter that ships
  runicnpc-<ver>.tar.gz (runicnpc/RunicNPC.cs + manifest.json) and SHA256SUMS.
  No bundle dispatch until stage 4.
- tools/: the rig panel scripts, with the panel and server ids moved into a
  git-ignored tools/rigs.json. `con.js` became `console.js`: CON is a reserved
  device name on Windows, and git there cannot open the file.
- README, CONTRIBUTING (edge-based flow, AI disclosure, borrow-not-copy),
  SECURITY, the code of conduct, issue and PR templates.

`feat:` so the cutover to main cuts the first release, 0.1.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

.gitea/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,33 @@
+<!--
+  Thanks for contributing to Runic Gateway!
+  Please fill out the sections below and check every box before requesting review.
+-->
+
+## What & why
+
+<!-- What does this PR change, and why? Link any related issue: "Closes #123". -->
+
+## How it was tested
+
+<!-- Commands you ran, manual steps, screenshots. -->
+
+## Checklist
+
+- [ ] I have read [CONTRIBUTING.md](CONTRIBUTING.md).
+- [ ] The change builds and existing tests/checks pass locally.
+- [ ] I have added or updated tests/docs where it makes sense.
+- [ ] My commits are reasonably scoped with clear messages.
+
+## AI-assisted contributions (required)
+
+This project **requires disclosure of AI tool usage**. Please pick one:
+
+- [ ] No AI tools were used to produce this contribution.
+- [ ] AI tools were used. Tool(s): `___________`. I have reviewed and understand
+      every change, and take responsibility for it. AI-authored commits are
+      marked with a `Co-Authored-By` / `Assisted-By` trailer.
+
+## License
+
+- [ ] I agree that my contribution is licensed under this project's license
+      (**GNU GPL v3.0 or later**), and I have the right to contribute it.