Say plainly at the top that there is no release yet

The repo is public and the install path is fully written up, so a reader
who finds it can follow INSTALL.md end to end without ever learning that
the release it depends on does not exist. The banner sits directly under
the title in both documents: no images are published, nothing here is
installable, and anything found elsewhere claiming to be a ForgeFIRM
image did not come from this project.

Documentation only - no behavior change, so no acceptance-catalog
consequence.

INSTALL.md

@@ -1,5 +1,15 @@
 # Installing OpenGlow/ForgeFIRM
 
+> # ⚠️ IN DEVELOPMENT — NOT YET RELEASED
+>
+> **ForgeFIRM has no public release yet.** No images are published, nothing here
+> is installable, and there is no supported way to put this on a machine. The
+> documentation describes the firmware as it is being built and validated on the
+> bench — it is here to be read, not followed.
+>
+> If you come across a file claiming to be a ForgeFIRM image, it did not come
+> from this project.
+
 ForgeFIRM installs **alongside** the factory firmware on the stock eMMC,
 using the factory's own A/B rootfs slot scheme: the installer writes
 ForgeFIRM to the slot the factory firmware is *not* running from, and

README.md

@@ -1,5 +1,15 @@
 # OpenGlow/ForgeFIRM Firmware for Glowforge
 
+> # ⚠️ IN DEVELOPMENT — NOT YET RELEASED
+>
+> **ForgeFIRM has no public release yet.** No images are published, nothing here
+> is installable, and there is no supported way to put this on a machine. The
+> documentation describes the firmware as it is being built and validated on the
+> bench — it is here to be read, not followed.
+>
+> If you come across a file claiming to be a ForgeFIRM image, it did not come
+> from this project.
+
 Open-source firmware for Glowforge brand CNC lasers. ForgeFIRM replaces the
 cloud-dependent factory software on the **stock control board** — no hardware
 modification — and gives the machine a local controller, a local web control