fix(z3): robust = conversion + SQLite pager spec (DB.2)

- Fixed infix = conversion regex: global replace replaces restrictive lookbehind version
- Also catches = inside =>, and, or bodies (not just depth 0)
- Fixed implies keyword support in expression translation
- Fixed SQLitePager.speck: implies→->, string-typed enum comparison fix
- All specs (ToggleSwitch, KafkaKRaft, SQLitePager) produce zero-error SMT-LIB2
- All 37 tests pass

compiler/test-output/RetryHandler.specbom.spdx.json

@@ -13,7 +13,7 @@
     "spdxVersion": "3.0.1",
     "dataLicense": "CC0-1.0",
     "creationInfo": {
-      "created": "2026-05-10T06:24:31.496Z",
+      "created": "2026-05-10T08:01:08.891Z",
       "createdBy": [
         "Organization: Speckl",
         "tool: speckl-compile-0.2.0"
@@ -27,7 +27,7 @@
           "@type": "spdx:Tool",
           "name": "speckl-compile"
         },
-        "timestamp": "2026-05-10T06:24:31.496Z",
+        "timestamp": "2026-05-10T08:01:08.891Z",
         "comment": "Review type: manual"
       }
     ]