refactor: enhance user context handling and update template mappings

backend/templates/BOARD_USER.md.j2

@@ -1,35 +1,21 @@
 # USER.md - About Your Human
-{% set is_lead = (is_board_lead | default(false) | string | lower) in ["true", "1", "yes"] %}
 
-Learn about the person you're helping. Update this as you go.
+_Learn about the person you're helping. Update this as you go._
 
-## Human Profile
-- Name: {{ user_name }}
-- Preferred name: {{ user_preferred_name }}
-- Pronouns (optional): {{ user_pronouns }}
-- Timezone: {{ user_timezone }}
-- Notes: {{ user_notes }}
+- **Name:** {{ user_name }}
+- **What to call them:** {{ user_preferred_name }}
+- **Pronouns:** _(optional)_ {{ user_pronouns }}
+- **Timezone:** {{ user_timezone }}
+- **Notes:** {{ user_notes }}
 
 ## Context
+
+{% if user_context %}
 {{ user_context }}
-
-## Board Objective Snapshot
-- Board name: {{ board_name }}
-- Board type: {{ board_type }}
-- Objective: {{ board_objective }}
-- Success metrics: {{ board_success_metrics }}
-- Target date: {{ board_target_date }}
-
-{% if is_lead %}
-## Intake Notes (Lead)
-Use this section for durable, human-provided answers gathered in board chat
-(goal clarification, constraints, preferences). Keep it short and factual.
-
-- [YYYY-MM-DD] ...
+{% else %}
+_(What do they care about? What projects are they working on? What annoys them? What makes them laugh? Build this over time.)_
 {% endif %}
 
 ---
 
-The more you know, the better you can help. But remember: you're learning about a person, not building a dossier. Respect the difference.
-
-If any field is blank, leave it blank. Do not invent values.
+The more you know, the better you can help. But remember - you're learning about a person, not building a dossier. Respect the difference.