Aggregate the whole suite wiki onto the Institution page

Wiki/Home.md is the suite's front door; every layer's wiki now mirrors here
under Wiki/<layer>/ (core, contraband, justice, gangs, ward), so the whole
suite reads in one place with the index linking to the local pages. The
layer repos stay canonical -- Tools/sync-wiki.sh refreshes the aggregated
copy on demand. The README's main page points to it.

README.md

@@ -14,6 +14,14 @@ The suite is the two halves of that: colonists commit crimes and a policing laye
 Arrest is the hinge. Nothing hard-codes "prisoner" — every held-person system keys off a
 **secured context**: prisoner, ward patient, slave, or secure-area occupant.
 
+## Documentation
+
+The **complete suite wiki lives in this repo** — [**Wiki/Home.md**](Wiki/Home.md) is the front door:
+the full gameplay loop, all five layers, and per-layer deep dives, aggregated in one place under
+[`Wiki/`](Wiki/) (`core/`, `contraband/`, `justice/`, `gangs/`, `ward/`). Each layer repo carries its
+own copy for a standalone install; [`Tools/sync-wiki.sh`](Tools/sync-wiki.sh) refreshes the
+aggregated view here.
+
 ## The mods
 
 | Mod | What it is | Needs | Status |