The harness is the corridor: a wall that holds the run to the plan, a shield that holds
the workspace safe. Inside it the work passes through three roles. Every accepted change writes a commit,
and the arch reads that commit's diff against the spec it wrote. A failed check sends the work back a stage.
settled
active
sent back
not yet reached
Harness · wall
Harness · shield
Git · one commit per accepted change
ARCH
writes the spec, reviews the diff
WORKER
makes the change
EXECUTORS
build and check, in parallel
MERGE
plan does not hold · new round
check fails · same round again
arch reads the diff against the spec
Run loground —
step 0 / 17
The corridor sets the direction, not the path. Progress is not one pass through the three
roles; it is rounds, and the commit line is what survives each one.