feat: add retrospective intelligence to create-story workflow

Load all retrospective files during story creation to carry forward
lessons learned, open action items, architecture corrections, and
deferred code review items. Fulfills Epic 2 retro action item A1.

Also includes Epic 2 retrospective and sprint status updates.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

_bmad/bmm/workflows/4-implementation/create-story/instructions.xml

@@ -181,7 +181,22 @@
     <invoke-protocol
       name="discover_inputs" />
     <note>Available content: {epics_content}, {prd_content}, {architecture_content}, {ux_content},
-    {project_context}</note>
+    {project_context}, {retrospective_content}</note>
+
+    <!-- Load retrospective lessons — Team Agreement: non-negotiable (Epic 2 Retro) -->
+    <critical>🔄 RETROSPECTIVE INTELLIGENCE — Load lessons learned from previous epics to prevent repeated mistakes!</critical>
+    <check if="retrospective files found in {retrospective_content}">
+      <action>From {retrospective_content}, extract and prioritize for current story:</action>
+      **RETROSPECTIVE INTELLIGENCE:**
+      - Action items still open or relevant to this epic
+      - Architecture corrections and doc drift identified
+      - Code patterns that worked well (to replicate)
+      - Problems encountered and solutions found (to avoid repeating)
+      - Team agreements and conventions established
+      - Deferred code review items that may affect this story
+      <action>Flag any action item that directly impacts this story's implementation</action>
+      <action>Include relevant retrospective lessons in the story's Dev Notes section</action>
+    </check>
 
     <!-- Analyze epics file for story foundation -->
     <action>From {epics_content}, extract Epic {{epic_num}} complete context:</action> **EPIC ANALYSIS:** - Epic
@@ -279,6 +294,11 @@
     file_structure_requirements</template-output>
     <template-output file="{default_output_file}">testing_requirements</template-output>
 
+    <!-- Retrospective intelligence -->
+    <check if="retrospective lessons available">
+      <template-output file="{default_output_file}">retrospective_intelligence</template-output>
+    </check>
+
     <!-- Previous story intelligence -->
     <check
       if="previous story learnings available">