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/test/context/project/config.test.ts

@@ -9,7 +9,7 @@ import {
 
 const removedAutoCommitKey = ['auto', 'commit'].join('_');
 
-describe('KTX project config', () => {
+describe('ktx project config', () => {
   it.each(['status', 'replay', 'run', 'watch'])('accepts former ingest subcommand name "%s" as a connection id', (connectionId) => {
     expect(
       parseKtxProjectConfig(`

packages/cli/test/context/project/project.test.ts

@@ -5,7 +5,7 @@ import { join } from 'node:path';
 import { afterEach, beforeEach, describe, expect, it } from 'vitest';
 import { initKtxProject, loadKtxProject } from '../../../src/context/project/project.js';
 
-describe('KTX local project runtime', () => {
+describe('ktx local project runtime', () => {
   let tempDir: string;
 
   beforeEach(async () => {

packages/cli/test/context/project/setup-config.test.ts

@@ -10,7 +10,7 @@ import {
   setKtxSetupDatabaseConnectionIds,
 } from '../../../src/context/project/setup-config.js';
 
-describe('KTX setup config helpers', () => {
+describe('ktx setup config helpers', () => {
   let tempDir: string;
 
   beforeEach(async () => {