feat: add SQL frontend, runtime expression evaluator, and Counterscale conformance research

SQL parser (ported from lanceql Zig): lexer, recursive descent parser, AST → QueryDescriptor
compiler. SqlWrappingExecutor handles features beyond FilterOp[] — OR, LIKE, NOT IN, HAVING,
multi-column ORDER BY, CASE/CAST/arithmetic in SELECT — via runtime expression evaluation.

Counterscale conformance test proves querymode handles all 7 query patterns from the popular
open-source analytics dashboard (32 tests). Includes 5 "query as code" tests demonstrating
what's impossible with Analytics Engine's HTTP SQL API: funnel analysis, conditional aggregation,
anomaly detection, 2-query collapse, and cross-dimension analysis — all in single-pass with
zero serialization boundary.

Research folder adds user interview guide, interview tracker, and prospecting templates.

Author: teamchong

package.json

@@ -24,7 +24,7 @@
     "test": "vitest run -c vitest.workers.config.ts && vitest run",
     "test:workers": "vitest run -c vitest.workers.config.ts",
     "test:node": "vitest run",
-    "test:quick": "vitest run -c vitest.workers.config.ts src/convenience.test.ts src/format.test.ts src/footer.test.ts src/decode.test.ts src/merge.test.ts src/partial-agg.test.ts src/vip-cache.test.ts src/page-processor.test.ts",
+    "test:quick": "vitest run -c vitest.workers.config.ts src/convenience.test.ts src/format.test.ts src/footer.test.ts src/decode.test.ts src/merge.test.ts src/partial-agg.test.ts src/vip-cache.test.ts src/page-processor.test.ts src/sql/lexer.test.ts src/sql/parser.test.ts src/sql/compiler.test.ts src/sql/evaluator.test.ts src/sql/integration.test.ts",
     "test:watch": "vitest",
     "deploy": "pnpm run build && wrangler deploy",
     "wasm": "pnpm run build:wasm",