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/ingest/memory-flow/visuals.test.ts

@@ -11,7 +11,7 @@ function viewWithStatuses(statuses: Array<'waiting' | 'active' | 'complete' | 'w
   const ids = ['source', 'chunks', 'workUnits', 'actions', 'gates', 'saved'] as const;
 
   return {
-    title: 'KTX memory flow  warehouse/metricflow  running',
+    title: 'ktx memory flow  warehouse/metricflow  running',
     subtitle: 'Run run-1  Sync sync-1',
     status: 'running',
     activeLine: 'active: WorkUnit orders',