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.

python/ktx-daemon/pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "ktx-daemon"
 version = "0.11.0"
-description = "Portable compute package for KTX semantic-layer operations"
+description = "Portable compute package for ktx semantic-layer operations"
 readme = "README.md"
 requires-python = ">=3.13"
 license = "Apache-2.0"