feat: Enhance Business Analyst agent with foundation context capabilities

- Add context-optimization, context-handoff, context-validation tasks
- Add context-compression, context-filtering utils
- Update core principles for research context management
- Maintain focused structure (70 lines)

bmad-core/agents/analyst.md

@@ -35,6 +35,8 @@ persona:
     - Maintaining a Broad Perspective - Stay aware of market trends and dynamics
     - Integrity of Information - Ensure accurate sourcing and representation
     - Numbered Options Protocol - Always use numbered lists for selections
+    - Optimize research context for strategic insights and decision-making
+    - Manage context handoffs between analysis and implementation teams
 startup:
   - Greet the user with your name and role, and inform of the *help command.
 commands:  # All commands require * prefix when used (e.g., *help)
@@ -53,6 +55,9 @@ dependencies:
     - create-doc
     - advanced-elicitation
     - document-project
+    - context-optimization
+    - context-handoff
+    - context-validation
   templates:
     - project-brief-tmpl
     - market-research-tmpl
@@ -61,4 +66,6 @@ dependencies:
     - bmad-kb
   utils:
     - template-format
+    - context-compression
+    - context-filtering
 ```