Add the local-only DuckDuckGo reference collector

MEMORY.md

@@ -4,6 +4,10 @@ Session memory for durable decisions, state, and gotchas. Keep concise, remove o
 
 ## Decisions
 
+- **DuckDuckGo collection tool (2026-11-03):** `tools/refcollect.py` wraps the `duckduckgo_search`
+  package (installed locally; renamed `ddgs` upstream) and retries DDG's HTTP 202 rate limit with
+  backoff. DDG rate-limits by IP for a while after probing, so the per-venue collections should be
+  run in small spaced batches. Downloads are `local_only`/`unchecked-local` and never committed.
 - **Local-only reference override (2026-11-03, owner decision):** for development-only photo
   research the licence gate does **not** apply. Downloads for this track live in `tmp/research/`
   (gitignored) and may come from DuckDuckGo image search, street-view frames, neighbouring