feat(pi-natives/tools): implemented utok tokenizer for multiple models

- Replaced the `ctok` implementation with the `utok` universal tokenizer supporting multiple model families and UTF text encodings.
- Added tokenizer support and embedding data for Qwen3, DeepSeek V3, Kimi K2, and GLM-5 model variants.
- Added fixture generation scripts, vocabulary packers, and golden test suites for validating tokenization parity.
- Updated dependency requirements and Bazel workspace definitions for new crates and tools.

packages/coding-agent/scripts/measure-prompt-tokens.ts

@@ -14,10 +14,9 @@ function est(s: string): number {
 await Settings.init({ inMemory: true, cwd: process.cwd() });
 const settings = Settings.isolated({});
 
-// Optional model id (argv[2]) scopes the counter to that model's tokenizer, so
-// the numbers match what the agent will actually be charged. Without it the
-// counts are the fast byte estimate the runtime uses for non-Claude models.
-const tokenizer = new Tokenizer(process.argv[2]);
+// This standalone inspection script has no resolved catalog Model; its counts
+// therefore intentionally use the runtime's default estimate policy.
+const tokenizer = new Tokenizer();
 
 const session: ToolSession = {
 	cwd: process.cwd(),