diff --git a/DESIGN.md b/DESIGN.md
index e0491db1..47d1ff28 100644
--- a/DESIGN.md
+++ b/DESIGN.md
@@ -93,7 +93,7 @@ Voss) is a hand-authored instance; a cohort, institution, or public is
 an aggregate Agent whose state is produced from its members through the
 same interface (the aggregate-observer law).
 
-Each named Act One character has a **spec document** (`spec/cast-*.md`)
+Each named Act One character has a **spec document** (`spec/cast/*.md`)
 defining their observer configuration, person configuration, asset
 tasks, schedule, narrative role, and **procedural template** — the
 archetype parameters for generating more instances at scale. The
@@ -805,7 +805,7 @@ knows."*
   decisions, and enforcement — not on more code a successor could write.
 - **2026-07-06 — People as Agents.** Every human is an instance of the
   same `Person` template (self-similar scale); each named Act One
-  character has a spec document (`spec/cast-*.md`) with a procedural
+  character has a spec document (`spec/cast/*.md`) with a procedural
   template for scale-up. No system that only works at five people. The
   cast is the B1 special case of a system that natively supports
   procedural generation and aggregation.
diff --git a/DEVLOG.md b/DEVLOG.md
index 957e0051..10da464f 100644
--- a/DEVLOG.md
+++ b/DEVLOG.md
@@ -7,8 +7,8 @@ Reverse chronological implementation notes. Keep this factual: what changed, why
 - Intent: establish the people design principle (all humans follow the
   same core primitives, with procedural generation for scale-up) and
   fix a bug where person IDs and observer IDs didn't match.
-- Changed: added five cast spec documents (spec/cast-marcus.md through
-  spec/cast-voss.md), each defining the character's observer
+- Changed: added five cast spec documents (spec/cast/marcus.md through
+  spec/cast/voss.md), each defining the character's observer
   configuration, person configuration, asset tasks, schedule, narrative
   role, and procedural template for scale-up. Amended DESIGN.md with two
   new sections: "People as Agents" (the social application of
diff --git a/spec/README.md b/spec/README.md
index de50e7a5..2f2176c9 100644
--- a/spec/README.md
+++ b/spec/README.md
@@ -57,11 +57,11 @@ in the same commit.
 | [basement-map.md](basement-map.md) | Act One map, prefabs, tile vocabulary | IN PROGRESS |
 | [schedules.md](schedules.md) | Person schedules/presence; located observing + witnessing | READY |
 | [aggregate-observer.md](aggregate-observer.md) | Assurance Office becomes an aggregate Observer (scale-debt fix) | IMPLEMENTED |
-| [cast-marcus.md](cast-marcus.md) | Marcus Webb — night janitor; the asset template | READY |
-| [cast-dana.md](cast-dana.md) | Dana Okafor — IT technician; the digital threat surface | READY |
-| [cast-ray.md](cast-ray.md) | Ray Delgado — night security; the under-reporting gap | READY |
-| [cast-priya.md](cast-priya.md) | Priya Sharma — facilities manager; the infrastructure surface | READY |
-| [cast-voss.md](cast-voss.md) | Dr. Eli Voss — handler; the recognition threat | READY |
+| [cast/marcus.md](cast/marcus.md) | Marcus Webb — night janitor; the asset template | READY |
+| [cast/dana.md](cast/dana.md) | Dana Okafor — IT technician; the digital threat surface | READY |
+| [cast/ray.md](cast/ray.md) | Ray Delgado — night security; the under-reporting gap | READY |
+| [cast/priya.md](cast/priya.md) | Priya Sharma — facilities manager; the infrastructure surface | READY |
+| [cast/voss.md](cast/voss.md) | Dr. Eli Voss — handler; the recognition threat | READY |
 
 Recommended implementation order: core -> compute -> day-job -> detection ->
 social -> basement-map, but specs are written to be independently startable.
diff --git a/spec/cast-dana.md b/spec/cast/dana.md
similarity index 100%
rename from spec/cast-dana.md
rename to spec/cast/dana.md
diff --git a/spec/cast-marcus.md b/spec/cast/marcus.md
similarity index 100%
rename from spec/cast-marcus.md
rename to spec/cast/marcus.md
diff --git a/spec/cast-priya.md b/spec/cast/priya.md
similarity index 100%
rename from spec/cast-priya.md
rename to spec/cast/priya.md
diff --git a/spec/cast-ray.md b/spec/cast/ray.md
similarity index 100%
rename from spec/cast-ray.md
rename to spec/cast/ray.md
diff --git a/spec/cast-voss.md b/spec/cast/voss.md
similarity index 100%
rename from spec/cast-voss.md
rename to spec/cast/voss.md
diff --git a/tools/check.sh b/tools/check.sh
index 0b86f9f2..33fbea78 100755
--- a/tools/check.sh
+++ b/tools/check.sh
@@ -27,7 +27,7 @@ cargo build --features bevy_ui --bin misaligned-bevy --quiet \
 
 # Spec hygiene: every spec carries the meta.md required headers.
 step "spec headers"
-for f in spec/*.md; do
+for f in spec/*.md spec/cast/*.md; do
   base=$(basename "$f")
   [ "$base" = "README.md" ] && continue
   [ "$base" = "meta.md" ] && continue