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-runtime.ts

@@ -124,7 +124,7 @@ export interface ManagedPythonRuntimeDoctorCheck {
 
 /** @internal */
 export const MISSING_UV_RUNTIME_INSTALL_MESSAGE =
-  'uv is required to install the KTX Python runtime. KTX does not download uv automatically. Install uv, make sure it is on PATH, and retry: ktx admin runtime install --yes';
+  'uv is required to install the ktx Python runtime. ktx does not download uv automatically. Install uv, make sure it is on PATH, and retry: ktx admin runtime install --yes';
 
 function defaultAssetDir(): string {
   return fileURLToPath(new URL('../assets/python/', import.meta.url));
@@ -250,7 +250,7 @@ export async function verifyRuntimeAsset(input: { assetDir: string }): Promise<M
         [
           `Missing bundled Python runtime manifest: ${manifestPath}`,
           'In a source checkout, build the local runtime assets with: pnpm run artifacts:build',
-          'Then retry the runtime-backed KTX command.',
+          'Then retry the runtime-backed ktx command.',
         ].join('\n'),
       );
     }