refactor: enforce ktx naming and AGENTS.md compliance sweep (#289)

Align the tree with AGENTS.md/CLAUDE.md conventions:

- Rewrite user-facing strings, docs, and tests to lowercase `ktx`
  (no bare uppercase `KTX` tokens remain outside literal identifiers).
- Drop the legacy `historicSql` migration path and its now-unused
  helpers, per the no-backward-compat rule.
- Remove `as unknown as` / `any` casts: narrow `BaseTool` generics to
  `z.ZodObject`, add a typed `createLookerClient`, and delete the dead
  `getParametersSchema`/`toAnthropicFormat` pre-AI-SDK helpers.
- Use `InvalidArgumentError` for Commander parse failures.
- Finish the adapter→connector prose conversion in the `ktx.yaml` docs
  while keeping the literal `adapters` config key.

packages/cli/src/managed-python-http.ts

@@ -65,7 +65,7 @@ function normalizedBaseUrl(baseUrl: string): string {
 function parseJsonObject(raw: string, path: string): Record<string, unknown> {
   const parsed = JSON.parse(raw) as unknown;
   if (!parsed || typeof parsed !== 'object' || Array.isArray(parsed)) {
-    throw new Error(`KTX daemon HTTP ${path} returned non-object JSON`);
+    throw new Error(`ktx daemon HTTP ${path} returned non-object JSON`);
   }
   return parsed as Record<string, unknown>;
 }
@@ -96,7 +96,7 @@ async function postManagedDaemonJson(
           const text = Buffer.concat(chunks).toString('utf8');
           const statusCode = response.statusCode ?? 0;
           if (statusCode < 200 || statusCode >= 300) {
-            reject(new Error(`KTX daemon HTTP ${path} failed with ${statusCode}: ${text}`));
+            reject(new Error(`ktx daemon HTTP ${path} failed with ${statusCode}: ${text}`));
             return;
           }
           try {
@@ -138,7 +138,7 @@ export function createManagedPythonDaemonBaseUrlResolver(
       force: false,
     });
     const verb = daemon.status === 'started' ? 'Started' : 'Using existing';
-    writePrefixedLines((chunk) => options.io.stderr.write(chunk), `${verb} KTX daemon: ${daemon.baseUrl}`);
+    writePrefixedLines((chunk) => options.io.stderr.write(chunk), `${verb} ktx daemon: ${daemon.baseUrl}`);
     cachedBaseUrl = daemon.baseUrl;
     return cachedBaseUrl;
   };