Complete extension SDK maturity

workplans/GUIDE-BOARD-WP-0003-extension-sdk-maturity.md

@@ -4,7 +4,7 @@ type: workplan
 title: "Extension SDK Maturity"
 repo: guide-board
 domain: markitect
-status: active
+status: completed
 owner: codex
 planning_priority: high
 planning_order: 3
@@ -69,7 +69,7 @@ Progress:
 
 ```task
 id: GUIDE-BOARD-WP-0003-T002
-status: todo
+status: done
 priority: high
 state_hub_task_id: "b87e68c1-6eca-4274-8e3f-6e2854c5a1e1"
 ```
@@ -81,11 +81,22 @@ Acceptance:
   normalize native result artifacts explicitly.
 - Add tests that prove a normalizer can map native output into evidence.
 
+Progress:
+
+- Added `guide_board.normalizers.normalize_step_result`.
+- Extended `normalizers` manifest entries to support Python module descriptor
+  objects while preserving the existing string shorthand.
+- Invoked matching normalizers after runner execution and before evidence
+  writing.
+- Merged normalizer result fields over runner results and recorded
+  `normalizer_refs` in evidence facts.
+- Added test coverage through the SDK fixture run.
+
 ## D3.3 - SDK Fixture Extension And Acceptance Tests
 
 ```task
 id: GUIDE-BOARD-WP-0003-T003
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "f3738751-5a0d-4eaf-85b1-75e599a78060"
 ```
@@ -97,11 +108,19 @@ Acceptance:
 - Cover external repo discovery, schema validation, normalizer invocation, plan
   generation, and result package shape.
 
+Progress:
+
+- Added `extensions/sdk-fixture`.
+- Included extension-owned target and assessment schemas, fixture profiles, a
+  native-output runner, a normalizer, and a mapping set.
+- Added a unit test that copies the fixture as an external extension repository
+  and verifies plan, evidence, mapping, and assessment package output.
+
 ## D3.4 - Extension Authoring Documentation Refresh
 
 ```task
 id: GUIDE-BOARD-WP-0003-T004
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "3d390bd4-755b-462a-9e16-9c859990d99e"
 ```
@@ -114,6 +133,14 @@ Acceptance:
 - Link the SDK maturity guidance from the assessment operations and external
   extension acceptance docs where useful.
 
+Progress:
+
+- Refreshed `docs/EXTENSION-SDK.md` with profile schema descriptors,
+  normalizer descriptors, context fields, merge semantics, and fixture guidance.
+- Linked SDK authoring contracts from `docs/ASSESSMENT-OPERATIONS.md`.
+- Linked `extensions/sdk-fixture` from `docs/EXTERNAL-EXTENSION-ACCEPTANCE.md`.
+- Added README references for the SDK fixture and WP3.
+
 ## Definition Of Done
 
 - External extension repositories can declare and test domain-specific profile