reliability: low reasoning_effort, retry-with-backoff, LLM call logging
- send top-level reasoning_effort: "low" (LLM_REASONING_EFFORT) to cut the qwen3.8-27b CoT ~85%, so content is no longer truncated to null -> the ~50% 502s
- new env: LLM_MAX_TOKENS (default 4000, per-call opts.maxTokens still overrides), LLM_REASONING_EFFORT (default "low", off/empty omits the field)
- chat() retries up to 3 attempts: timeout/abort, 5xx, network errors (ECONNRESET/ECONNREFUSED/socket closed), null/empty content; backoff 2s->3s (2000*1.5^(n-1), +/-20% jitter); 4xx throws immediately
- logging: '[llm] chat ok' {ms, finishReason} on success; '[llm] chat failed' {attempts, lastStatus, message, totalMs} on final failure
- tests: 12 in llm.test.ts (retry success/failure, no 4xx retry, null-content retry, logging spies); AGENTS.md env table + gotchas updated
kamilkrzywda
3297658c81