packaging: registry dep, publish scope, CI workflow

- @tenere/pltc-core switches from a machine-local file: dependency to the
  published ^0.6.3 from the Tenere npm registry (the file: path does not
  exist in a fresh checkout; lockfile regenerated to the tarball).
- .npmrc routes @tenere and @arbiter scopes alongside @rigor so registry
  installs and the eventual publish resolve against the hub.
- package.json gains a files whitelist (src/ only) so tests, benchmarks,
  and scratch directories never ship in the tarball.
- .gitea/workflows/ci.yaml: node 22, full suite + rigor campaigns on push/
  PR, npm publish on v* tags to the Arbiter org registry.

.gitea/workflows/ci.yaml

@@ -0,0 +1,61 @@
+name: CI
+
+on:
+  push:
+    branches: [master, main]
+    tags: ['v*']
+  pull_request:
+    branches: [master, main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Auth for Gitea npm registry
+        run: |
+          echo "@rigor:registry=https://hub.kl1.tenere.ai/api/packages/Rigor/npm/" > .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Rigor/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+          echo "@tenere:registry=https://hub.kl1.tenere.ai/api/packages/Tenere/npm/" >> .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Tenere/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+
+      - run: npm ci
+
+      - name: Full suite
+        run: npm test
+
+      - name: Rigor campaigns
+        run: npm run test:rigor
+
+  publish:
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs: test
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Auth for Gitea npm registry
+        run: |
+          echo "@rigor:registry=https://hub.kl1.tenere.ai/api/packages/Rigor/npm/" > .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Rigor/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+          echo "@tenere:registry=https://hub.kl1.tenere.ai/api/packages/Tenere/npm/" >> .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Tenere/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+          echo "@arbiter:registry=https://hub.kl1.tenere.ai/api/packages/Arbiter/npm/" >> .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Arbiter/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+
+      - run: npm ci
+
+      - run: npm publish