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/public-ingest.ts

@@ -875,8 +875,8 @@ function createPlainPublicIngestProgress(io: KtxCliIo, options: PlainPublicInges
 const INTERNAL_STATUS_LINE_RE =
   /^(Report|Run|Job|Status|Adapter|Connection|Sync|Diff|Tasks|Work units|Failed tasks|Saved memory|Provenance rows):\s*/;
 const ACTIONABLE_FAILURE_LINE_RE =
-  /^(Missing bundled Python runtime manifest|KTX Python runtime is required|KTX daemon HTTP|Error:|Failed\b|Could not\b|Cannot\b)/;
-const RUNTIME_BACKED_RETRY_LINE_RE = /^Then retry the runtime-backed KTX command\.?$/;
+  /^(Missing bundled Python runtime manifest|ktx Python runtime is required|ktx daemon HTTP|Error:|Failed\b|Could not\b|Cannot\b)/;
+const RUNTIME_BACKED_RETRY_LINE_RE = /^Then retry the runtime-backed ktx command\.?$/;
 
 function trimErrorPrefix(line: string): string {
   return line.replace(/^Error:\s*/, '');
@@ -887,7 +887,7 @@ function capturedFailureMessage(output: string): string | undefined {
     .split(/\r?\n/)
     .map((line) => line.trim())
     .filter((line) => line.length > 0)
-    .filter((line) => !line.startsWith('KTX scan completed'))
+    .filter((line) => !line.startsWith('ktx scan completed'))
     .filter((line) => !INTERNAL_STATUS_LINE_RE.test(line))
     .map(publicIngestOutputLine);