Forward each assistant reasoning part to /alpha/generate as
{type:"reasoning", text, signature?} instead of dropping it. DeepSeek
thinking mode rejects any request carrying tools whose prior assistant
turns omit their reasoning, so multi-turn tool-call conversations 400'd.
Only real (non-empty) reasoning is forwarded; no fabricated injection.
Update README and AGENTS.md accordingly.
Introduce COMMANDCODE_DEBUG=1 (and COMMANDCODE_DEBUG_FILE) to append a
request/stream trace to a log file. Trace points cover HTTP attempts
(status, retry wait, elapsed), stream event payloads, terminal finish and
usage, and redacted error bodies. Silent and no file created by default.
