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/node_modules/.vite/vitest/results.json

@@ -1 +1 @@
-{"version":"2.1.9","results":[[":__tests__/parser.test.ts",{"duration":37.504659999999944,"failed":false}],[":src/__tests__/compiler.test.ts",{"duration":10.64781099999999,"failed":false}]]}
+{"version":"2.1.9","results":[[":__tests__/parser.test.ts",{"duration":32.09780999999998,"failed":false}],[":src/__tests__/compiler.test.ts",{"duration":11.72437100000002,"failed":false}]]}