docs: add comprehensive work narrative with 4-layer framework for pipeline orchestration branch port

209-line narrative covering HIGH-LEVEL IMPACT, Truth Anchors (15 verifiable facts),
Problem-to-Value (6 technical areas), Constraint Signaling (12 hard constraints),
Strategic Role Mapping (7 capabilities), and Categorized Work Areas (9 domains).
All claims anchored to commit SHAs, issue numbers, file paths, and branch names.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: antmikinka