diff --git a/docs/PROGRESS.md b/docs/PROGRESS.md
index fcff5a2..bf473fd 100644
--- a/docs/PROGRESS.md
+++ b/docs/PROGRESS.md
@@ -2959,3 +2959,102 @@ Next recommended step:
 1. build the first concrete `freebsd-native-kernel` and `freebsd-native-world` outputs from `/usr/src`
 2. inspect/document their staged contents in `/frx/store`
 3. then wire a bootable system closure/image around those native outputs
+
+## 2026-04-03 — Phase 13.2: first native FreeBSD world/kernel outputs built from `/usr/src`
+
+Completed work:
+
+- wrote the Phase 13.2 report:
+  - `docs/reports/phase13-native-world-kernel-build-freebsd.md`
+- exercised the new native build path for real and produced the first concrete store outputs from `/usr/src`:
+  - native kernel output under `/frx/store`
+  - native world output under `/frx/store`
+- added a dedicated Phase 13.2 template/harness:
+  - `tests/system/phase13-native-base-pid1-operating-system.scm.in`
+  - `tests/system/run-phase13-native-base-build.sh`
+- fixed the first real native-build failure:
+  - `MAKEOBJDIRPREFIX` cannot be passed as a make command-line variable for this FreeBSD build path
+  - changed the native builder to invoke make as:
+    - `env MAKEOBJDIRPREFIX=... make ...`
+- fixed a subtle output-identity bug in the first `/usr/src` hash implementation:
+  - the initial `mtree`-based source hash accidentally included unstable header comments such as date/user/machine lines
+  - now strips `# ...` header lines before hashing
+  - this stabilized the source-tree identity and stopped the native output/build-root identity from drifting on each run
+- verified that native world and kernel now share the same:
+  - `source-tree-sha256`
+  - `build-root`
+- the first native world split remains intentionally runtime-oriented and prunes at least:
+  - `usr/share/doc`
+  - `usr/share/examples`
+  - `usr/share/info`
+  - `usr/share/man`
+  - `usr/tests`
+
+Concrete validated outputs:
+
+- native kernel store path:
+  - `/frx/store/93f35ddcb9a03f63f83c9e8ae29788685d339789da664f881822b4a1914f5ff6-freebsd-native-kernel-15.0-STABLE`
+- native world store path:
+  - `/frx/store/3f6f7f8c06ed8dad4cae21a1e8ac8ba4823bdb7cf54328c9bbcccaeb858beb77-freebsd-native-world-15.0-STABLE`
+- shared native build root:
+  - `/var/tmp/fruix-freebsd-native-build-c59b1b8128b305d9bad9cf3d654771c941c4e8b6a2732f6bc959df96d1d32f58`
+
+Validated native-world contents include at least:
+
+- `/bin/sh`
+- `/sbin/init`
+- `/etc/rc`
+- `/usr/sbin/sshd`
+- `/sbin/dhclient`
+- `/usr/bin/cap_mkdb`
+- `/usr/sbin/pwd_mkdb`
+- `/usr/share/locale/C.UTF-8/LC_CTYPE`
+
+Validated pruned paths are absent from the world output:
+
+- `/usr/share/man`
+- `/usr/tests`
+
+Validation:
+
+- real native-base `fruix system build` succeeded with an operating-system using:
+  - `freebsd-native-kernel`
+  - `freebsd-native-world`
+  - host-staged `freebsd-bootloader`
+  - `shepherd-pid1`
+- `tests/system/run-phase13-native-base-build.sh` passes:
+  - workdir: `/tmp/phase13-2-build-1775173551`
+  - result: `PASS phase13-native-base-build`
+- the harness confirmed:
+  - closure rebuild path reproducibility
+  - native kernel/world store paths exist
+  - native build info files exist
+  - world/kernel source-tree hashes match
+  - world/kernel build roots match
+  - native build logs exist
+  - `native-base-stores` is present in closure metadata
+  - host/native store boundary now looks as expected for this mixed system:
+    - `host_base_store_count=1`
+    - `native_base_store_count=2`
+
+Important findings:
+
+- the native build path is now real, not just modeled
+- the first mixed Phase-13 system boundary is explicit and sensible:
+  - host-staged bootloader only
+  - native kernel + native world
+  - Fruix runtime stores unchanged
+- the `mtree` preamble bug would have made native output identity drift across runs; fixing it was essential before treating these as reproducible store artifacts
+- the shared build-root result is important: the kernel/world pair now reuses the same `/usr/src` build state instead of acting like two unrelated builds
+
+Current assessment:
+
+- Phase 13.2 is complete
+- Fruix can now build and stage native FreeBSD base artifacts from `/usr/src` in `/frx/store`
+- the next step is to boot a system using those native outputs rather than stopping at build-time inspection
+
+Next recommended step:
+
+1. wire the image/boot path to use the native kernel/world outputs end-to-end
+2. validate locally with QEMU/UEFI
+3. validate on the approved XCP-ng VM and VDI path
diff --git a/docs/reports/phase13-native-world-kernel-build-freebsd.md b/docs/reports/phase13-native-world-kernel-build-freebsd.md
new file mode 100644
index 0000000..fdc8b18
--- /dev/null
+++ b/docs/reports/phase13-native-world-kernel-build-freebsd.md
@@ -0,0 +1,176 @@
+# Phase 13.2: built the first native FreeBSD world and kernel artifacts from `/usr/src`
+
+Date: 2026-04-03
+
+## Goal
+
+After Phase 13.1 introduced native Fruix package/materialization support for FreeBSD base artifacts, the next step was to exercise that path for real:
+
+- build a kernel from `/usr/src`
+- build and stage a minimal runtime-oriented world from `/usr/src`
+- place both outputs under `/frx/store`
+- document the exact split of this first native base target
+
+## Implementation
+
+### 1. Fixed two important builder issues found during the first real run
+
+#### `MAKEOBJDIRPREFIX` had to move to the environment
+
+The first real `buildworld` attempt failed with:
+
+```text
+MAKEOBJDIRPREFIX can only be set in environment or src-env.conf(5)
+```
+
+The native build path originally passed `MAKEOBJDIRPREFIX=...` as a make command-line variable.  That was corrected so the generated build command now uses:
+
+- `env MAKEOBJDIRPREFIX=... make ...`
+
+instead.
+
+#### The initial `/usr/src` tree hash was accidentally unstable
+
+The first source-tree hashing attempt hashed the raw `mtree -c` output.  That was subtly wrong because `mtree` includes header comments such as:
+
+- date
+- user
+- machine
+- tree path banner
+
+As a result, successive hash computations differed even when `/usr/src` had not changed.
+
+This was corrected by stripping the leading `# ...` comment lines before hashing the `mtree` content.  After that fix:
+
+- native world and native kernel reported the same `source-tree-sha256`
+- both reused the same native build root
+- output identity stopped drifting on each run
+
+## First concrete native outputs
+
+A native Fruix system definition using:
+
+- `freebsd-native-kernel`
+- `freebsd-native-world`
+- host-staged `freebsd-bootloader`
+- `shepherd-pid1`
+
+was built successfully.
+
+Resulting store outputs:
+
+- kernel:
+  - `/frx/store/93f35ddcb9a03f63f83c9e8ae29788685d339789da664f881822b4a1914f5ff6-freebsd-native-kernel-15.0-STABLE`
+- world:
+  - `/frx/store/3f6f7f8c06ed8dad4cae21a1e8ac8ba4823bdb7cf54328c9bbcccaeb858beb77-freebsd-native-world-15.0-STABLE`
+
+Native build metadata records for both outputs show:
+
+- `source-root=/usr/src`
+- the same `source-tree-sha256`
+- `kernconf=GENERIC`
+- the same shared `build-root`
+
+Shared build root:
+
+- `/var/tmp/fruix-freebsd-native-build-c59b1b8128b305d9bad9cf3d654771c941c4e8b6a2732f6bc959df96d1d32f58`
+
+Key log files recorded in the output metadata:
+
+- `buildworld.log`
+- `buildkernel-GENERIC.log`
+- `install-freebsd-native-world.log`
+- `install-freebsd-native-kernel.log`
+
+## First native world split
+
+The first `freebsd-native-world` output is intentionally runtime-oriented.  Validation confirmed that it contains the core pieces needed by the existing Fruix guest model, including:
+
+- `/bin/sh`
+- `/sbin/init`
+- `/etc/rc`
+- `/usr/sbin/sshd`
+- `/sbin/dhclient`
+- `/usr/bin/cap_mkdb`
+- `/usr/sbin/pwd_mkdb`
+- `/usr/share/locale/C.UTF-8/LC_CTYPE`
+
+The first prune list is also active.  Validation confirmed the world output does **not** contain:
+
+- `/usr/share/man`
+- `/usr/tests`
+
+This keeps the first native world output closer to the current boot/runtime target instead of a fully unpruned base install tree.
+
+## Store-boundary result
+
+The generated closure metadata now shows the intended transitional boundary clearly:
+
+- `host_base_store_count=1`
+- `host_base_stores=` bootloader only
+- `native_base_store_count=2`
+- `native_base_stores=` native kernel + native world
+
+That means Fruix now has a mixed but explicit Phase-13 system boundary:
+
+- bootloader still comes from the old host-staged path
+- kernel and core runtime world now come from native `/usr/src`-built store outputs
+
+## Validation
+
+### Direct build through `fruix system build`
+
+A real native-base system build succeeded and produced:
+
+- native kernel store output
+- native world store output
+- a system closure referencing those outputs
+
+### Dedicated Phase 13.2 harness
+
+Added:
+
+- `tests/system/phase13-native-base-pid1-operating-system.scm.in`
+- `tests/system/run-phase13-native-base-build.sh`
+
+Passing run:
+
+- `PASS phase13-native-base-build`
+- workdir: `/tmp/phase13-2-build-1775173551`
+
+Key metadata from that run:
+
+```text
+kernel_store=/frx/store/93f35ddcb9a03f63f83c9e8ae29788685d339789da664f881822b4a1914f5ff6-freebsd-native-kernel-15.0-STABLE
+world_store=/frx/store/3f6f7f8c06ed8dad4cae21a1e8ac8ba4823bdb7cf54328c9bbcccaeb858beb77-freebsd-native-world-15.0-STABLE
+host_base_store_count=1
+native_base_store_count=2
+world_source_tree_sha256=72a451e2ea47c4c4777035f797dc35f8d905eaabb2a717bc1fd71019f3021f72
+kernel_source_tree_sha256=72a451e2ea47c4c4777035f797dc35f8d905eaabb2a717bc1fd71019f3021f72
+world_build_root=/var/tmp/fruix-freebsd-native-build-c59b1b8128b305d9bad9cf3d654771c941c4e8b6a2732f6bc959df96d1d32f58
+kernel_build_root=/var/tmp/fruix-freebsd-native-build-c59b1b8128b305d9bad9cf3d654771c941c4e8b6a2732f6bc959df96d1d32f58
+```
+
+The harness also verified:
+
+- closure rebuild path reproducibility
+- existence of required kernel/world runtime files
+- absence of the pruned world paths
+- presence of native build metadata and logs
+- presence of `native-base-stores` in closure store-layout metadata
+
+## Assessment
+
+Phase 13.2 is complete.
+
+Fruix now does more than describe native FreeBSD base artifacts: it actually builds them from `/usr/src`, stores them under `/frx/store`, and records enough metadata to inspect how they were produced.
+
+This is the first point where Fruix can honestly say that part of the FreeBSD base is no longer just a curated copy of the builder host.
+
+## Next recommended step
+
+Proceed to Phase 13.3:
+
+- wire the operating-system/image path to boot using these native kernel/world outputs
+- validate locally with QEMU/UEFI
+- validate on the approved XCP-ng VM/VDI path
diff --git a/modules/fruix/system/freebsd.scm b/modules/fruix/system/freebsd.scm
index 0212a65..d6944bb 100644
--- a/modules/fruix/system/freebsd.scm
+++ b/modules/fruix/system/freebsd.scm
@@ -276,8 +276,11 @@
                      (build-plan-ref plan 'kernconf "GENERIC"))))
 
 (define (native-build-source-tree-sha256 source-root)
-  (string-hash
-   (command-output "mtree" "-c" "-k" "type,link,size,mode,sha256digest" "-p" source-root)))
+  (let* ((mtree-output (command-output "mtree" "-c" "-k" "type,link,size,mode,sha256digest" "-p" source-root))
+         (stable-lines (filter (lambda (line)
+                                 (not (string-prefix? "#" line)))
+                               (string-split mtree-output #\newline))))
+    (string-hash (string-join stable-lines "\n"))))
 
 (define (native-build-common-manifest plan)
   (let* ((source-root (build-plan-ref plan 'source-root "/usr/src"))
@@ -383,10 +386,9 @@
   (string-append "/var/tmp/fruix-freebsd-native-build-"
                  (string-hash (object->string common))))
 
-(define (native-make-arguments common build-root)
+(define (native-make-arguments common _build-root)
   (append
    (list "-C" (assoc-ref common 'source-root)
-         (string-append "MAKEOBJDIRPREFIX=" build-root "/obj")
          (string-append "TARGET=" (assoc-ref common 'target))
          (string-append "TARGET_ARCH=" (assoc-ref common 'target-arch))
          (string-append "KERNCONF=" (assoc-ref common 'kernconf)))
@@ -395,7 +397,7 @@
 (define* (make-command-string common build-root target #:key (parallel? #f) (destdir #f))
   (string-join
    (append
-    (list "make")
+    (list "env" (string-append "MAKEOBJDIRPREFIX=" build-root "/obj") "make")
     (if parallel?
         (list (string-append "-j" (current-build-jobs)))
         '())
diff --git a/tests/system/phase13-native-base-pid1-operating-system.scm.in b/tests/system/phase13-native-base-pid1-operating-system.scm.in
new file mode 100644
index 0000000..2c75d99
--- /dev/null
+++ b/tests/system/phase13-native-base-pid1-operating-system.scm.in
@@ -0,0 +1,71 @@
+(use-modules (fruix system freebsd)
+             (fruix packages freebsd))
+
+(define phase13-operating-system
+  (operating-system
+   #:host-name "fruix-freebsd"
+   #:kernel freebsd-native-kernel
+   #:bootloader freebsd-bootloader
+   #:base-packages (list freebsd-native-world)
+   #:groups (list (user-group #:name "wheel" #:gid 0 #:system? #t)
+                  (user-group #:name "sshd" #:gid 22 #:system? #t)
+                  (user-group #:name "_dhcp" #:gid 65 #:system? #t)
+                  (user-group #:name "operator" #:gid 1000 #:system? #f))
+   #:users (list (user-account #:name "root"
+                               #:uid 0
+                               #:group "wheel"
+                               #:comment "Charlie &"
+                               #:home "/root"
+                               #:shell "/bin/sh"
+                               #:system? #t)
+                 (user-account #:name "sshd"
+                               #:uid 22
+                               #:group "sshd"
+                               #:comment "Secure Shell Daemon"
+                               #:home "/var/empty"
+                               #:shell "/usr/sbin/nologin"
+                               #:system? #t)
+                 (user-account #:name "_dhcp"
+                               #:uid 65
+                               #:group "_dhcp"
+                               #:comment "dhcp programs"
+                               #:home "/var/empty"
+                               #:shell "/usr/sbin/nologin"
+                               #:system? #t)
+                 (user-account #:name "operator"
+                               #:uid 1000
+                               #:group "operator"
+                               #:supplementary-groups '("wheel")
+                               #:comment "Fruix Operator"
+                               #:home "/home/operator"
+                               #:shell "/bin/sh"
+                               #:system? #f))
+   #:file-systems (list (file-system #:device "/dev/gpt/fruix-root"
+                                     #:mount-point "/"
+                                     #:type "ufs"
+                                     #:options "rw"
+                                     #:needed-for-boot? #t)
+                        (file-system #:device "devfs"
+                                     #:mount-point "/dev"
+                                     #:type "devfs"
+                                     #:options "rw"
+                                     #:needed-for-boot? #t)
+                        (file-system #:device "tmpfs"
+                                     #:mount-point "/tmp"
+                                     #:type "tmpfs"
+                                     #:options "rw,size=64m"))
+   #:services '(shepherd ready-marker sshd)
+   #:loader-entries '(("autoboot_delay" . "1")
+                      ("boot_multicons" . "YES")
+                      ("boot_serial" . "YES")
+                      ("console" . "comconsole,vidconsole"))
+   #:rc-conf-entries '(("clear_tmp_enable" . "NO")
+                       ("hostid_enable" . "NO")
+                       ("sendmail_enable" . "NONE")
+                       ("sshd_enable" . "YES")
+                       ("ifconfig_xn0" . "SYNCDHCP")
+                       ("ifconfig_em0" . "SYNCDHCP")
+                       ("ifconfig_vtnet0" . "SYNCDHCP"))
+   #:init-mode 'shepherd-pid1
+   #:ready-marker "/var/lib/fruix/ready"
+   #:root-authorized-keys '("__ROOT_AUTHORIZED_KEY__")))
diff --git a/tests/system/run-phase13-native-base-build.sh b/tests/system/run-phase13-native-base-build.sh
new file mode 100755
index 0000000..afc0e90
--- /dev/null
+++ b/tests/system/run-phase13-native-base-build.sh
@@ -0,0 +1,224 @@
+#!/bin/sh
+set -eu
+
+project_root=${PROJECT_ROOT:-$(pwd)}
+script_dir=$(CDPATH= cd -- "$(dirname "$0")" && pwd)
+fruix_cmd=$project_root/bin/fruix
+os_template=${OS_TEMPLATE:-$script_dir/phase13-native-base-pid1-operating-system.scm.in}
+system_name=${SYSTEM_NAME:-phase13-operating-system}
+store_dir=${STORE_DIR:-/frx/store}
+metadata_target=${METADATA_OUT:-}
+root_authorized_key_file=${ROOT_AUTHORIZED_KEY_FILE:-$HOME/.ssh/id_ed25519.pub}
+
+[ -x "$fruix_cmd" ] || {
+  echo "fruix command is not executable: $fruix_cmd" >&2
+  exit 1
+}
+[ -f "$os_template" ] || {
+  echo "missing operating-system template: $os_template" >&2
+  exit 1
+}
+[ -f "$root_authorized_key_file" ] || {
+  echo "missing root authorized key file: $root_authorized_key_file" >&2
+  exit 1
+}
+
+cleanup=0
+if [ -n "${WORKDIR:-}" ]; then
+  workdir=$WORKDIR
+  mkdir -p "$workdir"
+else
+  workdir=$(mktemp -d /tmp/fruix-phase13-native-build.XXXXXX)
+  cleanup=1
+fi
+if [ "${KEEP_WORKDIR:-0}" -eq 1 ]; then
+  cleanup=0
+fi
+
+cleanup_workdir() {
+  if [ "$cleanup" -eq 1 ]; then
+    rm -rf "$workdir" 2>/dev/null || sudo rm -rf "$workdir"
+  fi
+}
+trap cleanup_workdir EXIT INT TERM
+
+phase13_os_file=$workdir/phase13-native-base-operating-system.scm
+build_out_a=$workdir/build-a.txt
+build_out_b=$workdir/build-b.txt
+metadata_file=$workdir/phase13-native-base-build-metadata.txt
+root_authorized_key=$(tr -d '\n' < "$root_authorized_key_file")
+sed "s|__ROOT_AUTHORIZED_KEY__|$root_authorized_key|g" "$os_template" > "$phase13_os_file"
+
+action_env() {
+  sudo env \
+    HOME="$HOME" \
+    GUILE_AUTO_COMPILE=0 \
+    FRUIX_FREEBSD_BUILD_JOBS="${FRUIX_FREEBSD_BUILD_JOBS:-8}" \
+    GUIX_SOURCE_DIR="${GUIX_SOURCE_DIR:-$HOME/repos/guix}" \
+    GUILE_BIN="${GUILE_BIN:-/tmp/guile-freebsd-validate-install/bin/guile}" \
+    GUILE_EXTRA_PREFIX="${GUILE_EXTRA_PREFIX:-/tmp/guile-gnutls-freebsd-validate-install}" \
+    SHEPHERD_PREFIX="${SHEPHERD_PREFIX:-/tmp/shepherd-freebsd-validate-install}" \
+    "$@"
+}
+
+printf 'Using fruix command: %s\n' "$fruix_cmd"
+printf 'Working directory: %s\n' "$workdir"
+printf 'Store directory: %s\n' "$store_dir"
+printf 'OS template: %s\n' "$os_template"
+
+action_env "$fruix_cmd" system build "$phase13_os_file" --system "$system_name" --store "$store_dir" >"$build_out_a"
+action_env "$fruix_cmd" system build "$phase13_os_file" --system "$system_name" --store "$store_dir" >"$build_out_b"
+
+closure_path=$(sed -n 's/^closure_path=//p' "$build_out_a")
+closure_rebuild_path=$(sed -n 's/^closure_path=//p' "$build_out_b")
+kernel_store=$(sed -n 's/^kernel_store=//p' "$build_out_a")
+bootloader_store=$(sed -n 's/^bootloader_store=//p' "$build_out_a")
+host_base_store_count=$(sed -n 's/^host_base_store_count=//p' "$build_out_a")
+host_base_stores=$(sed -n 's/^host_base_stores=//p' "$build_out_a")
+native_base_store_count=$(sed -n 's/^native_base_store_count=//p' "$build_out_a")
+native_base_stores=$(sed -n 's/^native_base_stores=//p' "$build_out_a")
+fruix_runtime_store_count=$(sed -n 's/^fruix_runtime_store_count=//p' "$build_out_a")
+fruix_runtime_stores=$(sed -n 's/^fruix_runtime_stores=//p' "$build_out_a")
+host_base_provenance_file=$(sed -n 's/^host_base_provenance_file=//p' "$build_out_a")
+store_layout_file=$(sed -n 's/^store_layout_file=//p' "$build_out_a")
+reference_count=$(sed -n 's/^reference_count=//p' "$build_out_a")
+generated_file_count=$(sed -n 's/^generated_file_count=//p' "$build_out_a")
+
+[ -n "$closure_path" ] || { echo "missing closure path" >&2; exit 1; }
+[ "$closure_path" = "$closure_rebuild_path" ] || {
+  echo "native-base closure path was not reproducible: $closure_path != $closure_rebuild_path" >&2
+  exit 1
+}
+case "$kernel_store" in
+  /frx/store/*-freebsd-native-kernel-15.0-STABLE) : ;;
+  *) echo "unexpected native kernel store path: $kernel_store" >&2; exit 1 ;;
+esac
+case "$bootloader_store" in
+  /frx/store/*-freebsd-bootloader-15.0-STABLE) : ;;
+  *) echo "unexpected bootloader store path: $bootloader_store" >&2; exit 1 ;;
+esac
+[ "$host_base_store_count" = 1 ] || { echo "expected exactly one host-staged base store, got: $host_base_store_count" >&2; exit 1; }
+[ "$native_base_store_count" = 2 ] || { echo "expected exactly two native base stores, got: $native_base_store_count" >&2; exit 1; }
+[ -n "$fruix_runtime_store_count" ] || { echo "missing Fruix runtime store count" >&2; exit 1; }
+[ -n "$reference_count" ] || { echo "missing reference count" >&2; exit 1; }
+[ -n "$generated_file_count" ] || { echo "missing generated file count" >&2; exit 1; }
+
+world_store=$(printf '%s\n' "$native_base_stores" | tr ',' '\n' | grep 'freebsd-native-world-15.0-STABLE$' | head -n 1)
+[ -n "$world_store" ] || { echo "failed to recover native world store from metadata" >&2; exit 1; }
+
+world_build_info=$world_store/.freebsd-native-build-info.scm
+kernel_build_info=$kernel_store/.freebsd-native-build-info.scm
+[ -f "$world_build_info" ] || { echo "missing world build info: $world_build_info" >&2; exit 1; }
+[ -f "$kernel_build_info" ] || { echo "missing kernel build info: $kernel_build_info" >&2; exit 1; }
+[ -f "$host_base_provenance_file" ] || { echo "missing host base provenance file: $host_base_provenance_file" >&2; exit 1; }
+[ -f "$store_layout_file" ] || { echo "missing store layout file: $store_layout_file" >&2; exit 1; }
+
+for path in \
+  "$kernel_store/boot/kernel/kernel" \
+  "$kernel_store/boot/kernel/linker.hints" \
+  "$world_store/bin/sh" \
+  "$world_store/sbin/init" \
+  "$world_store/etc/rc" \
+  "$world_store/usr/sbin/sshd" \
+  "$world_store/sbin/dhclient" \
+  "$world_store/usr/bin/cap_mkdb" \
+  "$world_store/usr/sbin/pwd_mkdb" \
+  "$world_store/usr/share/locale/C.UTF-8/LC_CTYPE"
+do
+  [ -e "$path" ] || {
+    echo "required native world/kernel path missing: $path" >&2
+    exit 1
+  }
+done
+
+[ ! -e "$world_store/usr/share/man" ] || { echo "native world still contains pruned man pages" >&2; exit 1; }
+[ ! -e "$world_store/usr/tests" ] || { echo "native world still contains pruned tests" >&2; exit 1; }
+
+grep -F 'native-base-stores' "$store_layout_file" >/dev/null || {
+  echo "store layout metadata is missing native-base-stores" >&2
+  exit 1
+}
+
+grep -F 'source-root . "/usr/src"' "$world_build_info" >/dev/null || {
+  echo "world build info is missing /usr/src provenance" >&2
+  exit 1
+}
+
+grep -F 'source-root . "/usr/src"' "$kernel_build_info" >/dev/null || {
+  echo "kernel build info is missing /usr/src provenance" >&2
+  exit 1
+}
+
+world_source_tree_sha256=$(grep -o 'source-tree-sha256 . "[^"]*"' "$world_build_info" | head -n 1 | cut -d'"' -f2)
+kernel_source_tree_sha256=$(grep -o 'source-tree-sha256 . "[^"]*"' "$kernel_build_info" | head -n 1 | cut -d'"' -f2)
+world_build_root=$(grep -o 'build-root . "[^"]*"' "$world_build_info" | head -n 1 | cut -d'"' -f2)
+kernel_build_root=$(grep -o 'build-root . "[^"]*"' "$kernel_build_info" | head -n 1 | cut -d'"' -f2)
+world_build_log=$(grep -o 'buildworld-log . "[^"]*"' "$world_build_info" | head -n 1 | cut -d'"' -f2)
+kernel_build_log=$(grep -o 'buildkernel-log . "[^"]*"' "$kernel_build_info" | head -n 1 | cut -d'"' -f2)
+world_install_log=$(grep -o 'install-log . "[^"]*"' "$world_build_info" | head -n 1 | cut -d'"' -f2)
+kernel_install_log=$(grep -o 'install-log . "[^"]*"' "$kernel_build_info" | head -n 1 | cut -d'"' -f2)
+
+[ -n "$world_source_tree_sha256" ] || { echo "missing world source-tree hash" >&2; exit 1; }
+[ -n "$kernel_source_tree_sha256" ] || { echo "missing kernel source-tree hash" >&2; exit 1; }
+[ "$world_source_tree_sha256" = "$kernel_source_tree_sha256" ] || {
+  echo "native world/kernel source-tree hashes differ: $world_source_tree_sha256 != $kernel_source_tree_sha256" >&2
+  exit 1
+}
+[ "$world_build_root" = "$kernel_build_root" ] || {
+  echo "native world/kernel build roots differ: $world_build_root != $kernel_build_root" >&2
+  exit 1
+}
+
+for path in "$world_build_log" "$kernel_build_log" "$world_install_log" "$kernel_install_log"; do
+  [ -f "$path" ] || {
+    echo "expected native build log missing: $path" >&2
+    exit 1
+  }
+done
+
+closure_base=$(basename "$closure_path")
+cat >"$metadata_file" <<EOF
+workdir=$workdir
+phase13_os_file=$phase13_os_file
+closure_path=$closure_path
+closure_rebuild_path=$closure_rebuild_path
+closure_base=$closure_base
+kernel_store=$kernel_store
+world_store=$world_store
+bootloader_store=$bootloader_store
+host_base_store_count=$host_base_store_count
+host_base_stores=$host_base_stores
+native_base_store_count=$native_base_store_count
+native_base_stores=$native_base_stores
+fruix_runtime_store_count=$fruix_runtime_store_count
+fruix_runtime_stores=$fruix_runtime_stores
+host_base_provenance_file=$host_base_provenance_file
+store_layout_file=$store_layout_file
+reference_count=$reference_count
+generated_file_count=$generated_file_count
+world_source_tree_sha256=$world_source_tree_sha256
+kernel_source_tree_sha256=$kernel_source_tree_sha256
+world_build_root=$world_build_root
+kernel_build_root=$kernel_build_root
+world_build_log=$world_build_log
+kernel_build_log=$kernel_build_log
+world_install_log=$world_install_log
+kernel_install_log=$kernel_install_log
+frontend_invocation=$fruix_cmd system build
+native_base_model=freebsd-world+freebsd-kernel-from-usr-src
+init_mode=shepherd-pid1
+EOF
+
+if [ -n "$metadata_target" ]; then
+  mkdir -p "$(dirname "$metadata_target")"
+  cp "$metadata_file" "$metadata_target"
+fi
+
+printf 'PASS phase13-native-base-build\n'
+printf 'Work directory: %s\n' "$workdir"
+printf 'Metadata file: %s\n' "$metadata_file"
+if [ -n "$metadata_target" ]; then
+  printf 'Copied metadata to: %s\n' "$metadata_target"
+fi
+printf '%s\n' '--- metadata ---'
+cat "$metadata_file"