Canon channel

The sixth Story delivery segment (Research · Monitor · Opinion · Tutor · Project · Canon): the chronicle of the domain's written substance advancing — arcs opened or extended and world expansions — whichever hand moved it (a pilot's manual generation or the autopilot's tutor fold). A display segment over the four-task machine loop, not a fifth engine task; events are emitted at the reducer mutation chokepoints with runId: "canon" so everything worth documenting is documented as a Story.