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.

examples/package-artifacts/README.md

@@ -14,7 +14,7 @@ generated local project.
 The managed Python runtime smoke requires `uv` on `PATH`, isolates
 `KTX_RUNTIME_ROOT`, verifies `ktx admin runtime status`, runs `ktx sl query --yes` to
 install the core runtime from the bundled wheel, checks `ktx admin runtime status`,
-starts and reuses the KTX daemon, and stops it.
+starts and reuses the **ktx** daemon, and stops it.
 
 The artifact manifest contains the public `@kaelio/ktx` npm tarball and the
 bundled `kaelio-ktx` runtime wheel. The smoke does not install standalone