Correct a claim I made three times today: 009 has not landed

specs/010-search-page-answers/contracts/answer_endpoint.md

@@ -221,9 +221,20 @@ A naive measurement reports 3.0s to first token. That token is the rephraser's.
 | retrieval finishing to the answer's first token | 6.1 |
 
 The largest block is no longer retrieval or preprocessing: it is the answer model's
-own time to first token with a retrieved context. Collection routing
-([009](../../009-collection-routing/spec.md)) already did most of the work on
-retrieval -- the 12.5s figure recorded here before it landed no longer reproduces.
+own time to first token with a retrieved context.
+
+**A correction to an earlier version of this file**, which said collection routing
+had landed and explained the improvement. It has not. What landed is *source*
+routing -- a question goes to the Reactome bundle, the user guide, or a live
+lookup -- while [009](../../009-collection-routing/spec.md), selecting among the
+collections *within* the Reactome bundle, is still unimplemented; retrieval
+searches all five.
+
+So the honest position on why the earlier 12.5s and ~36s figures no longer
+reproduce is that we do not fully know. Source routing accounts for the fast
+user-guide answers (3.3s to first token). Running preprocessing in two rounds
+accounts for about 2.5s. The rest may simply be that those figures came from one
+question and were never representative.
 
 One measurement worth keeping in view for anyone optimising this: the async
 retrieval path is **not faster than the sync one** here -- 12.5s against 10.9s on the

specs/010-search-page-answers/tasks.md

@@ -60,7 +60,7 @@ state.
 - [x] T019a Run preprocessing in two rounds instead of four sequential calls in src/agent/profiles/react_to_me.py; the base class already overlapped, and this override discarded it (PR #238)
 - [ ] T020 Reduce query expansion from 5 variants, measuring recall with bin/retrieval_baseline — its own call plus a 5x retrieval fan-out
 - [ ] T020c Establish whether a search-page question needs all four preprocessing calls. The sequential half of this is answered and done (T019a): they run in two rounds and cost 2.6s at the median, not the ~16s recorded here, which never reproduced
-- [x] T021 Land spec 009 collection routing and re-measure — landed and live (`state["active_sources"][0]` selects at retrieval time), and re-measured 2026-09-18: it is the main reason first-token fell from the ~36s once recorded to 9.6s
+- [ ] T021 Land spec 009 collection routing and re-measure. **Still open — I marked this done on 2026-09-18 and was wrong.** What landed is *source* routing (`resolve_active_sources` picks reactome / userguide / live). Collection routing is selecting among the five collections *within* the reactome bundle, and it is not implemented: `QueryIntent` has no `collections` field, `resolve_collections` does not exist, and `retrieve_documents` still loops over every collection
 - [ ] T022 Re-assess FR-005 against the result and say plainly whether 2s/10s is reachable
 
 ## Phase 6: Handover