diff --git a/.custodian-brief.md b/.custodian-brief.md
index b776195..48f375b 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,11 +2,23 @@
 # Custodian Brief — markitect-tool
 
 **Domain:** markitect  
-**Last synced:** 2026-05-04 02:09 UTC  
+**Last synced:** 2026-05-04 08:53 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
+### Internal Extension Framework and Canonical Processing Model
+Progress: 2/9 done  |  workstream_id: `5eea103f-f584-4360-b7e3-c5b09a4814bd`
+
+**Open tasks:**
+- · Define canonical processing model  `8c88b9a7`
+- · Implement extension descriptors and registries  `3fb2fe81`
+- · Add callback hooks and execution lifecycle  `be8f2056`
+- · Refactor query engines behind registry  `0226c1d1`
+- · Refactor processors and local backend as registered extensions  `a966dcbb`
+- · Refactor CLI composition to reduce central wiring  `3e88ca62`
+- · Document extension authoring conventions  `848e2a5e`
+
 ### Document Function Layer
 Progress: 0/8 done  |  workstream_id: `f82e74c4-d349-4e9e-80cd-10c0c6d9545d`
 
@@ -20,18 +32,6 @@ Progress: 0/8 done  |  workstream_id: `f82e74c4-d349-4e9e-80cd-10c0c6d9545d`
 - · Define capability and policy gates  `2a51b42c`
 - … and 1 more open tasks
 
-### Advanced Query and Local Index Backend
-Progress: 0/7 done  |  workstream_id: `d61a82e4-651a-4df2-944a-9ff996b2e1f6`
-
-**Open tasks:**
-- · P7.1 - Implement local snapshot store  `8894a9a4`
-- · P7.2 - Add AST introspection commands  `fb9eaa9d`
-- · P7.3 - Add optional JSONPath query adapter  `a7b46b32`
-- · P7.4 - Build SQLite metadata and JSON index  `479f11a3`
-- · P7.5 - Add FTS5 section/block search  `0f03e9be`
-- · P7.6 - Add incremental refresh  `7d9472e6`
-- · P7.7 - Add local index CLI  `35cc63ff`
-
 ### Markdown Dataflow Pipeline Workflows
 Progress: 0/8 done  |  workstream_id: `ed4c491d-4f81-4df0-af51-5f4bd4d1ad91`