evidence-dsl: extract Evidence DSL v2 compiler from @arbiter/core

The Evidence DSL (ADR-000) is a thin declarative layer that compiles to
engine rule types. It has zero runtime coupling to the core engine
(DSLCompiler takes an arbiter as a duck-typed argument; the only shared
code was the ip-utils helpers, now local). Extracting it into its own
package keeps the core artifact free of the DSL surface.

- @arbiter/evidence-dsl depends on @arbiter/core (config formats are the
  compilation target)
- deep-path exports for the compiler, parser, generator, validation,
  and built-in functions (the surface the core's DSL tests consume)
- tests moved alongside; generate-parser script + peggy devDep local
- CI: test on push, publish on v* tags

.gitea/workflows/ci.yaml

@@ -0,0 +1,56 @@
+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 "@arbiter:registry=https://hub.kl1.tenere.ai/api/packages/Arbiter/npm/" > .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Arbiter/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+          echo "@tenere:registry=https://hub.kl1.tenere.ai/api/packages/Tenere/npm/" >> .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Tenere/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+
+      - run: npm ci
+
+      - name: Full suite
+        run: npm test
+
+  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 "@arbiter:registry=https://hub.kl1.tenere.ai/api/packages/Arbiter/npm/" > .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Arbiter/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+          echo "@tenere:registry=https://hub.kl1.tenere.ai/api/packages/Tenere/npm/" >> .npmrc
+          echo "//hub.kl1.tenere.ai/api/packages/Tenere/npm/:_authToken=${{ secrets.PACKAGE_TOKEN }}" >> .npmrc
+
+      - run: npm ci
+
+      - run: npm publish