Mission Run Overview
Mission Run: Write-Side Context-Factory Adoption
Adopt the write execution path onto the frozen single context-factory seam — root, identity, and write-surface come from factory-projected fragments, not hand-rolled re-derivations — completing the read/write symmetry.
Mission A (read-path-error-fidelity) adopted the read path onto the existing build_execution_context factory, froze it, and declared a write-projection boundary contract. The write path still runs a second parallel factory that re-derives root (feature_dir.parent.parent walks), identity, and write-surface by hand — leaving the context fragments that encode them unread. This mission routes the bounded write-side re-derivations to consume those factory-projected fragments (turning them load-bearing), proving read/write symmetry end-to-end and advancing the coordination-topology strangler (#1716/#1878/#1619). It builds no new authority (C-001) — it adopts the frozen seam.