really nice bug report and fix — the repro and the ollama ps eviction trace made this trivial to verify. removing the hardcoded num_ctx=16384 and making it opt-in is exactly right, and the validation + regression tests are solid.

i pushed one small commit (da12fd93) adding HINDSIGHT_API_LLM_OLLAMA_NUM_CTX to .env.example (+ the byte-identical hindsight-embed copy) — new config flags need to land there per our checklist, and the env-template sync test stays green. hope you don't mind me pushing directly.

one thing to confirm before i merge: you're threading it from config.llm_ollama_num_ctx rather than per-member/per-bank, so it's static-global. i think that's the right call — context window is a property of the ollama host, not a per-bank preference — but it does diverge from the member.* pattern in that same ensemble block, so just confirm that's intentional and i'll merge.

Yes, that scope is intentional.

For the native Ollama path this PR changes, the override is a process-level config value: config.llm_ollama_num_ctx is threaded into LLMProvider / MemoryEngine and then used by _call_ollama_native(). It is not a member or bank field.

The behavior I intended and covered here is:

• unset env: do not send num_ctx, so Ollama's Modelfile/server/model default wins
• HINDSIGHT_API_LLM_OLLAMA_NUM_CTX=16384: preserve the old request-forced value for operators who want that migration path

I chose that scope because the bug was caused by Hindsight forcing a request-level Ollama runner option even when the Ollama deployment already had its own context configuration. If a deployment needs different context sizes per Ollama host/model, I think the safer path is server-side Modelfile settings or separate Hindsight processes rather than one shared process env var.

I also pushed cc207113 to keep the new config field optional for direct HindsightConfig construction (kw_only default None) and added a small regression for that compatibility case. Local py_compile passed for the touched config/test files; CI has started on the new head.

Thanks for adding the env-template entries and keeping the generated-files check green.