Module tokens 

Token counting with cascading fallback.

Attempts token counting in order:

1. API count_tokens (Anthropic-compatible endpoints)
2. tiktoken (OpenAI/GPT models)
3. Character estimate (4 chars ≈ 1 token)

Structs

TokenCounter

Token counter with cascading fallback.

Functions

create_token_counter

Create a TokenCounter from config values.