Boris Wiki Learnings Dedup Bug

Problem

_write_agent_page in wiki_writer.py uses a regex to remove existing same-date sections. The regex fails when multiple same-date sections exist — only removes the first, leaving duplicates. Boris has Feb 11 data 4x.

Impact

Visual noise in wiki pages. No functional impact.

Proposed Solution

Fix the regex to catch all same-date blocks. Clean up existing boris.md.

Acceptance Criteria

• Running wiki-writer for existing date replaces (not duplicates) the section
• Boris.md has exactly one Feb 11 section