iso 1.26.1: ship /etc/felhom/ — the directory the bootstrap writes its state into

FIX for the Part-5 failure. felhom-bootstrap.sh writes the appliance token (:431), the pairing code
(:435) and .bootstrap-done into /etc/felhom/. The old stub-first-boot.sh created it explicitly
('install -d -m 0755 /etc/felhom /usr/local/sbin'); packaging dropped the env FILE correctly and the
DIRECTORY with it. Measured consequence on a real interactive install: the box registered at the hub,
could not persist its token, and polled 'HTTP 401 — still retrying' forever with no claim code.

- build-deb.sh now ships ./etc/felhom/ (0755, empty) and ASSERTS it, plus ./usr/local/sbin/ and
  ./lib/systemd/system/, as G13. RED-PROOFED: removing the install -d makes the build exit 3 with
  'is not in the package (G13)', and restoring it goes green.
- The gate gains G13 with the reasoning: G7/G8/G9 all passed on the broken package. G9 proves the
  payload is the right payload and says NOTHING about what the payload depends on.

ISO_VERSION -> 1.26.1.

scripts/iso/build-felhom-iso.sh

@@ -48,7 +48,7 @@ set -euo pipefail
 # does not exist: the ISO is a frozen artifact, while felhom-host-install.sh is fetched at RUN TIME
 # from the website's git-sync of `main` (R-94/R-110), so whatever version an ISO carries, the script a
 # box runs is always current. Coupling them would invent a constraint. The claim is corrected instead.
-ISO_VERSION="1.26.0"   # the ISO's own version. INDEPENDENT of felhom-host-install.sh's SCRIPT_VERSION,
+ISO_VERSION="1.26.1"   # the ISO's own version. INDEPENDENT of felhom-host-install.sh's SCRIPT_VERSION,
                        # which is fetched at run time from main and is not frozen into the image.
 IMAGE="${FELHOM_ISO_ASSISTANT_IMAGE:-felhom-iso-assistant:trixie}"
 HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

scripts/iso/pkg/build-deb.sh

@@ -14,6 +14,7 @@
 # CONTENTS — exactly two files, and deliberately not three:
 #   /usr/local/sbin/felhom-bootstrap.sh      0755   (byte-identical to scripts/iso/felhom-bootstrap.sh)
 #   /lib/systemd/system/felhom-bootstrap.service 0644
+#   /etc/felhom/                             0755   (empty — the bootstrap's runtime state dir)
 # The old stub also wrote /etc/felhom/bootstrap.env (0600). This package does NOT, because
 # felhom-bootstrap.sh:91 reads it only `if [[ -r ... ]]` and its defaults at :95-96 are EXACTLY what
 # the generic pairing env set (build-felhom-iso.sh:257-258). Shipping it would add a 0600 file to a
@@ -34,6 +35,14 @@ WORK="$(mktemp -d "${TMPDIR:-/tmp}/felhom-deb.XXXXXX")"
 trap 'rm -rf "$WORK"' EXIT
 ROOT="$WORK/pkg"
 install -d -m 0755 "$ROOT/DEBIAN" "$ROOT/usr/local/sbin" "$ROOT/lib/systemd/system"
+# /etc/felhom is the bootstrap's RUNTIME STATE directory, and shipping it is not optional:
+# felhom-bootstrap.sh writes the appliance token there (:431), the pairing code (:435) and
+# .bootstrap-done (the unit's ConditionPathExists). The old stub created it explicitly
+# (stub-first-boot.sh: `install -d -m 0755 /etc/felhom /usr/local/sbin`). Dropping the env FILE from
+# this package was correct; dropping the DIRECTORY with it was not — a box installed without it
+# registers at the hub, fails to persist its token, and then 401s forever without ever showing a
+# claim code. Measured on a real interactive install, 2026-07-31.
+install -d -m 0755 "$ROOT/etc/felhom"
 
 sed "s/^Package: /Version: $VERSION\nPackage: /" /dev/null >/dev/null 2>&1 || true
 { head -1 "$HERE/debian/control"; echo "Version: $VERSION"; tail -n +2 "$HERE/debian/control"; } \
@@ -67,6 +76,13 @@ fi
 if [[ "$(tail -1 <<<"$POST_RAW")" != "exit 0" ]]; then
     echo "build-deb: postinst does not end 'exit 0' (G8)" >&2; exit 3
 fi
+# G13 — every directory the payload writes into must be IN the package. G9 proves the script is the
+# right script; it says nothing about the directories that script needs.
+for d in ./etc/felhom/ ./usr/local/sbin/ ./lib/systemd/system/; do
+    if ! dpkg-deb -c "$DEB" | awk '{print $6}' | grep -qx "$d"; then
+        echo "build-deb: $d is not in the package (G13) — the payload would fail at run time" >&2; exit 3
+    fi
+done
 A="$(dpkg-deb --fsys-tarfile "$DEB" | tar -xO ./usr/local/sbin/felhom-bootstrap.sh | sha256sum | cut -d' ' -f1)"
 B="$(sha256sum "$ISO_DIR/felhom-bootstrap.sh" | cut -d' ' -f1)"
 if [[ "$A" != "$B" ]]; then