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

scripts/generate-parser.js

@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+
+/**
+ * Script to generate the DSL parser from Peggy grammar
+ */
+
+import peggy from 'peggy';
+import fs from 'fs';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const grammarPath = path.join(__dirname, '../src/grammar/dsl.peggy');
+const outputPath = path.join(__dirname, '../src/parser/GeneratedParser.js');
+
+console.log('Generating DSL parser from Peggy grammar...');
+console.log('Grammar:', grammarPath);
+console.log('Output:', outputPath);
+
+try {
+  // Read the grammar file
+  const grammar = fs.readFileSync(grammarPath, 'utf8');
+  
+  // Generate the parser
+  const parserSource = peggy.generate(grammar, {
+    format: 'es',
+    output: 'source',
+    grammarSource: 'dsl.peggy'
+  });
+  
+  // Write the generated parser
+  fs.writeFileSync(outputPath, parserSource);
+  
+  console.log('✅ Parser generated successfully!');
+  console.log('Generated file:', outputPath);
+  
+} catch (error) {
+  console.error('❌ Error generating parser:');
+  console.error(error.message);
+  
+  if (error.format) {
+    console.error('\nFormatted error:');
+    console.error(error.format([
+      { source: 'dsl.peggy', text: fs.readFileSync(grammarPath, 'utf8') }
+    ]));
+  }
+  
+  process.exit(1);
+}