Fault multigrid: the rulings, what ships, and what is still on a branch, as a capability guide

docs/developer/design/fault-parallel-placement-2026-09.md

@@ -1,5 +1,9 @@
 # Fault networks in parallel: what moves, why, and the decision (September 2026)
 
+**Status:** implemented on `development` (#669, #672). The rulings it records
+(the base is never rebalanced; the fault's cell star is gathered onto one rank)
+are restated for users in [`guides/fault-multigrid.md`](../guides/fault-multigrid.md).
+
 This note records how the fault-network machinery behaves in parallel,
 the measurements that established it, the design decision taken with
 Louis on 2 September 2026, and the test that keeps the numbers honest.

docs/developer/design/fault-patch-multigrid-2026-08.md

@@ -1,5 +1,11 @@
 # Fault-patch multigrid: the measured skeleton (2026-08, #629)
 
+**Status:** implemented on `development` (#629: `set_custom_fmg(..., fac_zone=...)`,
+`FaultNetwork.build(width=...)`, `place_thin_volume(mesher="ladder")`). The user-facing
+rulings are in [`guides/fault-multigrid.md`](../guides/fault-multigrid.md); the
+split-level hierarchy that extends this design is on `feature/fault-split-multigrid`
+and recorded in the journal.
+
 The solver architecture for fault-system Stokes problems, settled by
 measurement on a 2-D analysis rig and ready to carry into 3-D. One
 sentence: **ordinary balanced multigrid solves the smooth problem —