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.

scripts/link-dev-cli.mjs

@@ -73,7 +73,7 @@ async function writePinnedPosixLauncher(globalBin, binPath, binaryName, writeFil
   const launcherPath = join(globalBin, binaryName);
   const script = [
     '#!/bin/sh',
-    '# Generated by `pnpm run link:dev` in the KTX workspace.',
+    '# Generated by `pnpm run link:dev` in the ktx workspace.',
     '# Keep this launcher pinned to the Node binary that built native dependencies.',
     `exec ${shellDoubleQuote(process.execPath)} ${shellDoubleQuote(binPath)} "$@"`,
     '',
@@ -88,7 +88,7 @@ async function writePinnedWindowsLauncher(globalBin, binPath, binaryName, writeF
   const launcherPath = join(globalBin, `${binaryName}.cmd`);
   const script = [
     '@echo off',
-    'REM Generated by `pnpm run link:dev` in the KTX workspace.',
+    'REM Generated by `pnpm run link:dev` in the ktx workspace.',
     `"${process.execPath}" "${binPath}" %*`,
     '',
   ].join('\r\n');
@@ -179,7 +179,7 @@ if (import.meta.url === pathToFileURL(process.argv[1]).href) {
       checkOnly: hasFlag('--check-only'),
       binaryName: optionValue('--name', 'ktx-dev'),
     });
-    process.stdout.write(`KTX CLI bin: ${result.binPath}\n`);
+    process.stdout.write(`ktx CLI bin: ${result.binPath}\n`);
     if (result.linked) {
       process.stdout.write(`Linked binary: ${result.binaryName}\n`);
       process.stdout.write(`Verified: ${result.verification.output}\n`);