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/setup-runtime.test.ts

@@ -71,7 +71,7 @@ describe('runKtxSetupRuntimeStep', () => {
   it('fails fast when required runtime features cannot be installed in no-input mode', async () => {
     const io = makeIo();
     const ensureRuntime = vi.fn(async () => {
-      throw new Error('KTX Python runtime is required for this command. Run: ktx admin runtime install --yes');
+      throw new Error('ktx Python runtime is required for this command. Run: ktx admin runtime install --yes');
     });
 
     await expect(
@@ -97,7 +97,7 @@ describe('runKtxSetupRuntimeStep', () => {
     expect(io.stderr()).toContain('ktx admin runtime install --yes');
   });
 
-  it('starts the KTX daemon for configured sentence-transformers embeddings', async () => {
+  it('starts the ktx daemon for configured sentence-transformers embeddings', async () => {
     const io = makeIo();
     const ensureLocalEmbeddings = vi.fn(async () => ({
       baseUrl: 'http://127.0.0.1:61234',