Add SpeckDL compiler scaffold

- CLI entry point with yargs parsing for speckl-compile <file> --output-dir --bom-format
- TypeScript parser with AST types for all SpeckDL primitives
- Generator for PROV-O JSON-LD provenance graphs
- Generator for CycloneDX v1.6 BOMs
- Generator for SPDX 3.0.1 BOMs
- E2E test verifying RetryHandler.speck parsing and all output formats

All tests pass.

compiler/test-output/RetryHandler.prov.jsonld

@@ -0,0 +1,60 @@
+{
+  "@context": {
+    "prov": "http://www.w3.org/ns/prov#",
+    "speckl": "https://speckl.scoble.me/ns/v0.2#",
+    "rdfs": "http://www.w3.org/2000/01/rdf-schema#"
+  },
+  "@graph": [
+    {
+      "@type": "prov:Entity",
+      "@id": "speck:RetryHandler",
+      "prov:qualifiedGeneration": {
+        "@type": "prov:Generation",
+        "prov:activity": {
+          "@type": "prov:Activity",
+          "prov:startTime": "2026-04-29T22:11:59.830Z"
+        }
+      },
+      "rdfs:label": "RetryHandler",
+      "prov:wasDerivedFrom": {
+        "@id": "speck:FaultHandler"
+      },
+      "rdfs:comment": "\"",
+      "speckl:satisfies": {
+        "@id": "requirement:RESILIENCE"
+      },
+      "prov:wasAttributedTo": {
+        "@id": "agent:\""
+      },
+      "prov:wasInformedBy": {
+        "@id": "source:architecture_review:\""
+      }
+    },
+    {
+      "@type": "prov:Entity",
+      "@id": "speck:FaultHandler"
+    },
+    {
+      "@type": "prov:Entity",
+      "@id": "requirement:RESILIENCE",
+      "rdfs:label": "RESILIENCE"
+    },
+    {
+      "@type": "prov:Entity",
+      "@id": "requirement:RESILIENCE",
+      "rdfs:label": "RESILIENCE"
+    },
+    {
+      "@type": "prov:Agent",
+      "@id": "agent:\"",
+      "rdfs:label": "\"",
+      "foaf:email": "Scott Scoble"
+    },
+    {
+      "@type": "prov:Activity",
+      "@id": "source:architecture_review:\"",
+      "prov:type": "architecture_review",
+      "rdfs:label": "architecture_review - \""
+    }
+  ]
+}