startcode

docs: update count_tokens heuristic, add UTF-8-safe SSE note, mention cargo test

fix(proxy): correct streaming output_index, close all tool blocks, CJK-friendly token count, UTF-8-safe SSE parser

fix: close all content blocks in Claude streaming and fix block index calculation

handle /v1/messages/count_tokens locally to avoid rate limiting

docs: update logging documentation for --log flag and per-session log files