diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..050f7c2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+
+# Pony build output (ichor)
+build/
diff --git a/docs/plans/D2-medium.md b/docs/plans/D2-medium.md
index 55802f0..aa0ee31 100644
--- a/docs/plans/D2-medium.md
+++ b/docs/plans/D2-medium.md
@@ -6,8 +6,8 @@ explicit that organs communicate by **perfusion, not direct wiring**; this is th
 **unnamed and unimplemented**.
 
 ## 2. Status / certainty
-SCAFFOLD · named **Ichor**, Pony starting scaffold at `src/ichor/` (envelope + broker + D1 barrier +
-C seam). Not yet compiled here (no `ponyc` in-env). Backing/transport now C3.
+SCAFFOLD · named **Ichor**, Pony scaffold at `src/ichor/` (envelope + broker + D1 barrier + C seam).
+**Compiles & runs** on ponyc 0.64.0 (smoke wiring green). Backing/transport now C3.
 
 ## 3. Language & location
 **Pony** (`src/ichor/`) — actor-model broker; capabilities give data-race-free sends. Transport split:
diff --git a/src/ichor/README.md b/src/ichor/README.md
index 5a3ad38..5d5a52a 100644
--- a/src/ichor/README.md
+++ b/src/ichor/README.md
@@ -22,15 +22,19 @@ seam (`ichor_ada_shim.c`) is where it crosses into the Ada border.
   reject an unscreened external payload, perfuse organ→organ.
 - `ichor_ada_shim.c` — the C/Fortran binding seam to the Ada D1 border (stub).
 
-## Build / run (needs ponyc — NOT installed in this env)
+## Build / run
 ```
-ponyc src/ichor -o build      # compile the package
+ponyc src/ichor -o build      # compile the package (built clean on ponyc 0.64.0)
 ./build/ichor                  # run the smoke wiring
 ```
+Expected output: internal secretion soul→brain perfused, external→brain rejected
+at D1, brain→soul cross-perfused. Install ponyc via `ponyup` if absent (the env
+is ephemeral, so the toolchain is per-session).
 To wire the real Ada border: build `ichor_ada_shim.c` into `libichor_ada`, enable
 `use "lib:ichor_ada"` + the `admit_via_ada` body in `barrier.pony`, and point the
 shim at an Ada `Trust_Guard.Screen_Inbound` export.
 
 ## Status
-Starting scaffold. Pony + Fortran toolchains are absent in this environment, so
-this is design-complete source to build where Pony exists — not yet compiled here.
+Starting scaffold — **compiles and runs** (ponyc 0.64.0). The Ada-side shim
+(`ichor_ada_shim.c`) is still a stub; wiring `Barrier.admit` to the real Ada
+`Trust_Guard` is the next step.
diff --git a/src/ichor/barrier.pony b/src/ichor/barrier.pony
index ea4bc24..6370d10 100644
--- a/src/ichor/barrier.pony
+++ b/src/ichor/barrier.pony
@@ -1,15 +1,13 @@
-"""
-The blood-brain barrier (D1). `Barrier.admit` is the screening decision every
-Brain-bound envelope must pass — perfusion law L2: everything reaching the Brain
-crosses Ada (D1) first.
-
-Real wiring crosses into Ada's `Trust_Guard` (provenance + blocklist + rate) via
-the C/Fortran seam (`ichor_ada_shim.c`). Until that binding is built, this mirrors
-the provenance law in pure Pony so the broker is testable standalone.
-
-To switch to the Ada border, add `use "lib:ichor_ada"` and replace the body of
-`admit` with the FFI call sketched below.
-"""
+// The blood-brain barrier (D1). `Barrier.admit` is the screening decision every
+// Brain-bound envelope must pass — perfusion law L2: everything reaching the
+// Brain crosses Ada (D1) first.
+//
+// Real wiring crosses into Ada's `Trust_Guard` (provenance + blocklist + rate)
+// via the C/Fortran seam (`ichor_ada_shim.c`). Until that binding is built, this
+// mirrors the provenance law in pure Pony so the broker is testable standalone.
+//
+// To switch to the Ada border, add `use "lib:ichor_ada"` and replace the body of
+// `admit` with the FFI call sketched below.
 
 primitive Barrier
   fun admit(envl: Envelope): Bool =>
diff --git a/src/ichor/broker.pony b/src/ichor/broker.pony
index 2c7891d..548fc3b 100644
--- a/src/ichor/broker.pony
+++ b/src/ichor/broker.pony
@@ -1,12 +1,10 @@
-"""
-The perfusion broker. Organs register, then emit envelopes by `route` — the
-broker delivers to the destination organ. Brain-bound traffic is forced through
-the D1 Barrier first (law L2). No organ holds another's reference (law L1); the
-broker is the only shared point.
-
-In full deployment this actor backs a socket broker hosted on the Ada barrier;
-here it routes in-process so the wiring is exercisable without sockets.
-"""
+// The perfusion broker. Organs register, then emit envelopes by `route` — the
+// broker delivers to the destination organ. Brain-bound traffic is forced through
+// the D1 Barrier first (law L2). No organ holds another's reference (law L1); the
+// broker is the only shared point.
+//
+// In full deployment this actor backs a socket broker hosted on the Ada barrier;
+// here it routes in-process so the wiring is exercisable without sockets.
 
 use "collections"
 
diff --git a/src/ichor/main.pony b/src/ichor/main.pony
index 5100cac..70d49b5 100644
--- a/src/ichor/main.pony
+++ b/src/ichor/main.pony
@@ -1,11 +1,8 @@
-"""
-Ichor smoke wiring (D2 §9 test): round-trip an envelope between two stub organs
-through the D1 admit check, and confirm an unscreened external payload is rejected
-at the barrier.
-
-Build (where ponyc exists):   ponyc src/ichor -o build
-Run:                          ./build/ichor
-"""
+// Ichor smoke wiring (D2 §9 test): round-trip an envelope between two stub organs
+// through the D1 admit check, and confirm an unscreened external payload is
+// rejected at the barrier.
+//
+// Build:  ponyc src/ichor -o build      Run:  ./build/ichor
 
 actor Main
   new create(env: Env) =>
diff --git a/src/ichor/organ.pony b/src/ichor/organ.pony
index 6c7cce7..cef1ca9 100644
--- a/src/ichor/organ.pony
+++ b/src/ichor/organ.pony
@@ -1,8 +1,6 @@
-"""
-What an organ is, to Ichor: anything that can receive a perfused envelope.
-Organs hold no hard reference to each other (perfusion law L1) — they only know
-the Broker. `StubOrgan` is a canned receiver for standalone tests.
-"""
+// What an organ is, to Ichor: anything that can receive a perfused envelope.
+// Organs hold no hard reference to each other (perfusion law L1) — they only know
+// the Broker. `StubOrgan` is a canned receiver for standalone tests.
 
 interface tag OrganReceiver
   be receive(envl: Envelope)