Adds the four POST routes whose state-layer support was already
dispatched by the manual_edit projector (edge_trust, edge_summary,
memory_pov_summary) plus a new edge_knowledge_fact dispatch branch for
add/remove fact list manipulation. Drawer template gains editable
textareas, sliders, and add/remove fact controls. Remove semantics on
knowledge_fact match by string (not index) so concurrent edge_update
events appending facts between drawer renders don't desync the form.
Joseph Doherty