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/src/memory-flow-hud.tsx

@@ -363,7 +363,7 @@ export function ActivityFeed(props: {
         </Box>
       )}
 
-      {/* Results — what KTX has created */}
+      {/* Results — what ktx has created */}
       {insights.length > 0 && (
         <Box flexDirection="column" marginTop={1}>
           <Text color={props.theme.text}>  Created so far:</Text>
@@ -395,7 +395,7 @@ export function ActivityFeed(props: {
         <Text color={props.theme.active}>{spinner(props.frame)} Saving to context layer...</Text>
       )}
       {savedEvent && (
-        <Text color={props.theme.complete}>✓ Saved — your agents can now use the KTX context layer</Text>
+        <Text color={props.theme.complete}>✓ Saved — your agents can now use the ktx context layer</Text>
       )}
 
       {/* Phase 7: Completion */}
@@ -430,12 +430,12 @@ function CompletionSummary(props: {
         <>
           <Text color={props.theme.border}>{'─'.repeat(60)}</Text>
           <Text bold color={props.theme.complete}>
-            ★ KTX finished ingesting your data
+            ★ ktx finished ingesting your data
           </Text>
           {(sl > 0 || wiki > 0) && (
             <>
               <Text />
-              <Text color={props.theme.text}>KTX created:</Text>
+              <Text color={props.theme.text}>ktx created:</Text>
               {sl > 0 && (
                 <Text color={props.theme.active}>
                   {'  '}📊 {sl} query definition{sl === 1 ? '' : 's'} — so agents can write accurate SQL for your data