chore: standardize daemon naming on "KTX daemon"

Replace inconsistent names ("KTX Python daemon", "KTX local embeddings
daemon", "KTX managed daemon", "Python daemon") with the single name
"KTX daemon" in CLI output, errors, command descriptions, test
assertions, smoke scripts, docs, AGENTS.md, issue templates, and
codecov flags. The daemon is a portable compute server with endpoints
for SQL analysis, semantic layer, LookML, database introspection, and
embeddings; the previous labels misrepresented it as embeddings-only or
exposed implementation details ("Python", "managed").

The "KTX Python runtime" concept (installed interpreter + packages) is
deliberately left as-is — it is a separate concept from the daemon
process.

packages/cli/src/managed-python-daemon.test.ts

@@ -125,7 +125,7 @@ function daemonOptionsBase(root: string) {
   } as const;
 }
 
-describe('managed Python daemon lifecycle', () => {
+describe('KTX daemon lifecycle', () => {
   let tempDir: string;
 
   beforeEach(async () => {