diff --git a/docs/PROGRESS.md b/docs/PROGRESS.md
index 8351f77..6220766 100644
--- a/docs/PROGRESS.md
+++ b/docs/PROGRESS.md
@@ -1791,3 +1791,79 @@ Current assessment:
 
 - Phase 6.2 is now satisfied on the current FreeBSD prototype track
 - the next step is to validate a minimal user-facing profile installation flow on top of these real store outputs
+
+## 2026-04-01 — Phase 6.3 completed: minimal profile installation validated on real store outputs
+
+Completed work:
+
+- added a runnable real-store profile harness:
+  - `tests/packages/run-phase6-real-store-profile-prototype.sh`
+- wrote the Phase 6.3 report:
+  - `docs/reports/phase6-real-store-profile-freebsd.md`
+- updated the Phase 6 package-build harnesses so they can recover derivation paths even when the requested outputs are already present in `/frx/store`
+- ran the real-store profile harness successfully and captured metadata under:
+  - `/tmp/phase6-real-store-profile-metadata.txt`
+
+Important findings:
+
+- the current FreeBSD track now has a minimal user-facing profile installation flow built on top of real Phase 6 store outputs rather than the earlier Phase 3 package/profile prototype inputs
+- the validated transaction semantics are intentionally small but real:
+  - generation 1 is created from the Phase 6.1 host-built store item
+  - generation 2 is created from the Phase 6.2 jail-built store item
+  - the `profile` symlink switches to generation 2
+  - both generations remain addressable
+- observed metadata confirmed:
+  - `profile_target=profile-2-link`
+  - `generation1_store_path=/frx/store/...-hello-2.12.3`
+  - `generation2_store_path=/frx/store/...-hello-2.12.3`
+  - `current_store_path=/frx/store/...-hello-2.12.3`
+  - `profile_hello_output=Hello, world!`
+  - `clean_env_hello_output=Hello, world!`
+- the upstream-derived profile layer is still not fully usable on this FreeBSD track because the current `guix profiles` / `fruix package` path still reaches the unresolved bootstrap-platform blocker:
+  - `dynamic linker name not known for this system "x86_64-freebsd15.0"`
+- despite that blocker, the minimal Fruix-owned profile path is now validated on top of real daemon-built store items
+
+Current assessment:
+
+- Phase 6.3 is now satisfied on the current FreeBSD prototype track
+- Phase 6 as a whole is now complete on the active FreeBSD amd64 prototype path
+
+## 2026-04-01 — Phase 6 completed on the current FreeBSD prototype track
+
+Phase 6 is now considered complete for the active FreeBSD amd64 prototype path.
+
+Why this milestone is satisfied:
+
+- **Phase 6.1** success criteria were met on the prototype track:
+  - a real package definition derived from Guix's `hello` package now builds through `fruix build`
+  - the output lands in `/frx/store`
+  - the package runs from the store and preserves a declared source reference
+- **Phase 6.2** success criteria were met on the prototype track:
+  - a real package build now executes inside a FreeBSD jail
+  - the build work runs under dropped numeric build credentials
+  - the jailed build succeeds into `/frx/store`
+- **Phase 6.3** success criteria were met on the prototype track:
+  - real Phase 6 store outputs can be installed into a minimal profile environment
+  - generation switching works in a concrete form
+  - package execution through the profile succeeds for the current user
+
+Important scope note:
+
+- this completes the **real FreeBSD-backed store-build milestone** on the current prototype track, not full upstream-package-graph support or full upstream profile-layer parity yet
+- the current package path still relies on a prefetched local source tarball for GNU Hello because the built-in downloader/root-daemon path remains a separate FreeBSD issue
+- the current profile-installation path is a Fruix-owned minimal layer over real store outputs because the upstream-derived profile code still hits the unresolved FreeBSD bootstrap-platform mapping blocker
+- nevertheless, the core Phase 6 question has now been answered positively:
+  - real package definitions can be built into `/frx/store`
+  - those builds can run under integrated jail/build-user isolation
+  - and the resulting store items can be exposed through a minimal user-facing profile flow
+
+Next recommended step:
+
+1. begin Phase 7.1 by defining a minimal Fruix operating-system model for FreeBSD
+2. carry forward the selective Fruix naming policy:
+  - Fruix at the product boundary
+  - `/frx` as the canonical store root
+  - stable upstream-derived internal names unless there is strong architectural value in renaming them
+3. keep the two remaining Phase 6 follow-up blockers visible but scoped:
+  - built-in downloader/root-daemon integration for real package origins
+  - upstream-derived profile/bootstrap-platform support for `x86_64-freebsd15.0`
diff --git a/docs/reports/phase6-real-store-profile-freebsd.md b/docs/reports/phase6-real-store-profile-freebsd.md
new file mode 100644
index 0000000..011da64
--- /dev/null
+++ b/docs/reports/phase6-real-store-profile-freebsd.md
@@ -0,0 +1,70 @@
+# Phase 6.3: Minimal profile installation validated on top of real store outputs
+
+Date: 2026-04-01
+
+## Summary
+
+This step validates a minimal user-facing profile installation flow using the real `/frx/store` outputs produced in Phases 6.1 and 6.2.
+
+Added file:
+
+- `tests/packages/run-phase6-real-store-profile-prototype.sh`
+
+## Validation command
+
+Run command:
+
+```sh
+METADATA_OUT=/tmp/phase6-real-store-profile-metadata.txt \
+./tests/packages/run-phase6-real-store-profile-prototype.sh
+```
+
+## What the harness does
+
+The harness:
+
+1. reruns the Phase 6.1 real-package build harness
+2. reruns the Phase 6.2 jail-integrated package build harness
+3. creates a minimal Fruix-owned profile transaction layout using those real store outputs
+4. installs generation 1 from the Phase 6.1 store item
+5. installs generation 2 from the Phase 6.2 store item
+6. switches the current `profile` symlink to generation 2
+7. validates:
+   - preserved generation links
+   - current-profile switching
+   - `PATH` usability
+   - execution from a nearly empty environment
+
+## Observed results
+
+Observed metadata included:
+
+- `profile=.../profile`
+- `profile_target=profile-2-link`
+- `generation1_store_path=/frx/store/...-hello-2.12.3`
+- `generation2_store_path=/frx/store/...-hello-2.12.3`
+- `current_store_path=/frx/store/...-hello-2.12.3`
+- `profile_hello_output=Hello, world!`
+- `clean_env_hello_output=Hello, world!`
+- `installation_mode=minimal-real-store-profile`
+
+## Important findings
+
+- the current FreeBSD track now has a minimal profile-generation and profile-switching story that operates on real store outputs rather than the earlier Phase 3 package/profile prototype layer
+- the profile transaction semantics are intentionally small but real:
+  - generation 1 is retained
+  - generation 2 is created
+  - the `profile` symlink is switched to generation 2
+  - executables become reachable through `PATH`
+- this step intentionally uses a Fruix-owned minimal profile harness because the upstream-derived `guix profiles` / `fruix package` path still runs into the unresolved FreeBSD bootstrap-platform issue:
+  - `dynamic linker name not known for this system "x86_64-freebsd15.0"`
+- even with that upstream profile-layer gap still open, the user-facing package-installation boundary is now validated in minimal form on top of real daemon-built store items
+
+## Conclusion
+
+Phase 6.3 is satisfied on the current FreeBSD prototype track:
+
+- packages built through the real store path can be installed into a profile-like user environment
+- generation switching works in a minimal but concrete form
+- package execution through the profile succeeds for the current user
+- Phase 6 as a whole is now complete on the active FreeBSD prototype path, with deeper upstream profile-layer integration remaining follow-up work rather than a blocker to this milestone
diff --git a/tests/guix/run-phase6-jail-package-build.sh b/tests/guix/run-phase6-jail-package-build.sh
index e2c1e1e..9998bc7 100755
--- a/tests/guix/run-phase6-jail-package-build.sh
+++ b/tests/guix/run-phase6-jail-package-build.sh
@@ -24,6 +24,7 @@ daemon_log=$workdir/guix-daemon.log
 fetch_tarball=$workdir/hello-2.12.3.tar.gz
 build_stdout=$workdir/fruix-build.out
 build_stderr=$workdir/fruix-build.err
+drv_stdout=$workdir/fruix-build-derivation.out
 references_log=$workdir/references.log
 package_template=$workdir/phase6-jail-hello.scm.in
 package_file=$workdir/phase6-jail-hello.scm
@@ -229,10 +230,12 @@ done
 }
 
 GUIX_DAEMON_SOCKET=unix://$daemon_socket \
-./pre-inst-env fruix build -f "$package_file" >"$build_stdout" 2>"$build_stderr"
+./pre-inst-env fruix build -d -f "$package_file" >"$drv_stdout" 2>>"$build_stderr"
+GUIX_DAEMON_SOCKET=unix://$daemon_socket \
+./pre-inst-env fruix build -f "$package_file" >"$build_stdout" 2>>"$build_stderr"
 
 out_path=$(awk 'NF { last = $0 } END { print last }' "$build_stdout")
-drv_path=$(sed -n 's/^successfully built //p' "$build_stderr" | tail -n 1)
+drv_path=$(awk 'NF { last = $0 } END { print last }' "$drv_stdout")
 runtime_output=$("$out_path/bin/hello")
 source_store_path=$(tr -d '\n' < "$out_path/share/fruix-phase6/source-store-path.txt")
 build_uid=$(tr -d '\n' < "$out_path/share/fruix-phase6/build-uid.txt")
@@ -242,7 +245,7 @@ build_mode=$(tr -d '\n' < "$out_path/share/fruix-phase6/build-mode.txt")
 GUIX_DAEMON_SOCKET=unix://$daemon_socket \
 ./pre-inst-env fruix gc --references "$out_path" >"$references_log" 2>"$workdir/fruix-gc.err"
 
-[ -n "$drv_path" ] || { echo "missing derivation path in $build_stderr" >&2; exit 1; }
+[ -n "$drv_path" ] || { echo "missing derivation path in $drv_stdout" >&2; exit 1; }
 case "$drv_path" in
   /frx/store/*.drv) : ;;
   *) echo "unexpected derivation path: $drv_path" >&2; exit 1 ;;
@@ -283,6 +286,7 @@ helper_source=$helper_source
 package_file=$package_file
 build_stdout=$build_stdout
 build_stderr=$build_stderr
+drv_stdout=$drv_stdout
 references_log=$references_log
 drv_path=$drv_path
 out_path=$out_path
diff --git a/tests/guix/run-phase6-real-package-build.sh b/tests/guix/run-phase6-real-package-build.sh
index 0943640..5f94fb2 100755
--- a/tests/guix/run-phase6-real-package-build.sh
+++ b/tests/guix/run-phase6-real-package-build.sh
@@ -24,6 +24,7 @@ daemon_log=$workdir/guix-daemon.log
 fetch_tarball=$workdir/hello-2.12.3.tar.gz
 build_stdout=$workdir/fruix-build.out
 build_stderr=$workdir/fruix-build.err
+drv_stdout=$workdir/fruix-build-derivation.out
 references_log=$workdir/references.log
 package_template=$workdir/phase6-hello.scm.in
 package_file=$workdir/phase6-hello.scm
@@ -151,16 +152,18 @@ done
 }
 
 GUIX_DAEMON_SOCKET=unix://$daemon_socket \
-./pre-inst-env fruix build -f "$package_file" >"$build_stdout" 2>"$build_stderr"
+./pre-inst-env fruix build -d -f "$package_file" >"$drv_stdout" 2>>"$build_stderr"
+GUIX_DAEMON_SOCKET=unix://$daemon_socket \
+./pre-inst-env fruix build -f "$package_file" >"$build_stdout" 2>>"$build_stderr"
 
 out_path=$(awk 'NF { last = $0 } END { print last }' "$build_stdout")
-drv_path=$(sed -n 's/^successfully built //p' "$build_stderr" | tail -n 1)
+drv_path=$(awk 'NF { last = $0 } END { print last }' "$drv_stdout")
 source_store_path=$(tr -d '\n' < "$out_path/share/fruix-phase6/source-store-path.txt")
 runtime_output=$("$out_path/bin/hello")
 GUIX_DAEMON_SOCKET=unix://$daemon_socket \
 ./pre-inst-env fruix gc --references "$out_path" >"$references_log" 2>"$workdir/fruix-gc.err"
 
-[ -n "$drv_path" ] || { echo "missing derivation path in $build_stderr" >&2; exit 1; }
+[ -n "$drv_path" ] || { echo "missing derivation path in $drv_stdout" >&2; exit 1; }
 case "$drv_path" in
   /frx/store/*.drv) : ;;
   *) echo "unexpected derivation path: $drv_path" >&2; exit 1 ;;
@@ -193,6 +196,7 @@ fetch_tarball=$fetch_tarball
 package_file=$package_file
 build_stdout=$build_stdout
 build_stderr=$build_stderr
+drv_stdout=$drv_stdout
 references_log=$references_log
 drv_path=$drv_path
 out_path=$out_path
diff --git a/tests/packages/run-phase6-real-store-profile-prototype.sh b/tests/packages/run-phase6-real-store-profile-prototype.sh
new file mode 100755
index 0000000..91f8e7a
--- /dev/null
+++ b/tests/packages/run-phase6-real-store-profile-prototype.sh
@@ -0,0 +1,144 @@
+#!/bin/sh
+set -eu
+
+repo_root=$(CDPATH= cd -- "$(dirname "$0")/../.." && pwd)
+metadata_target=${METADATA_OUT:-}
+
+cleanup=0
+if [ -n "${WORKDIR:-}" ]; then
+  workdir=$WORKDIR
+  mkdir -p "$workdir"
+else
+  workdir=$(mktemp -d /tmp/fruix-phase6-profile.XXXXXX)
+  cleanup=1
+fi
+if [ "${KEEP_WORKDIR:-0}" -eq 1 ]; then
+  cleanup=0
+fi
+
+metadata_file=$workdir/phase6-real-store-profile-metadata.txt
+phase61_metadata=$workdir/phase6-real-package-metadata.txt
+phase62_metadata=$workdir/phase6-jail-package-metadata.txt
+profile=$workdir/profile
+phase61_log=$workdir/phase6-real-package.log
+phase62_log=$workdir/phase6-jail-package.log
+
+cleanup_workdir() {
+  if [ "$cleanup" -eq 1 ]; then
+    rm -rf "$workdir"
+  fi
+}
+trap cleanup_workdir EXIT INT TERM
+
+install_generation() {
+  generation=$1
+  store_path=$2
+  label=$3
+  generation_dir=$workdir/profile-generation-$generation
+  generation_link=$profile-$generation-link
+
+  rm -rf "$generation_dir"
+  mkdir -p "$generation_dir"
+  for entry in "$store_path"/*; do
+    [ -e "$entry" ] || continue
+    ln -s "$entry" "$generation_dir/$(basename "$entry")"
+  done
+  cat >"$generation_dir/.fruix-profile-entry" <<EOF
+label=$label
+store_path=$store_path
+generation=$generation
+EOF
+
+  rm -f "$generation_link.new" "$generation_link"
+  ln -s "$generation_dir" "$generation_link.new"
+  mv -f "$generation_link.new" "$generation_link"
+
+  rm -f "$profile"
+  ln -s "$(basename "$generation_link")" "$profile"
+}
+
+METADATA_OUT=$phase61_metadata WORKDIR=$workdir/phase6-61 KEEP_WORKDIR=1 \
+  "$repo_root/tests/guix/run-phase6-real-package-build.sh" >"$phase61_log" 2>&1
+METADATA_OUT=$phase62_metadata WORKDIR=$workdir/phase6-62 KEEP_WORKDIR=1 \
+  "$repo_root/tests/guix/run-phase6-jail-package-build.sh" >"$phase62_log" 2>&1
+
+phase61_out=$(sed -n 's/^out_path=//p' "$phase61_metadata")
+phase62_out=$(sed -n 's/^out_path=//p' "$phase62_metadata")
+phase61_runtime=$(sed -n 's/^runtime_output=//p' "$phase61_metadata")
+phase62_runtime=$(sed -n 's/^runtime_output=//p' "$phase62_metadata")
+
+[ "$phase61_runtime" = 'Hello, world!' ] || {
+  echo "phase6.1 prerequisite failed: $phase61_runtime" >&2
+  exit 1
+}
+[ "$phase62_runtime" = 'Hello, world!' ] || {
+  echo "phase6.2 prerequisite failed: $phase62_runtime" >&2
+  exit 1
+}
+
+install_generation 1 "$phase61_out" phase6-real-package
+install_generation 2 "$phase62_out" phase6-jail-package
+
+profile_target=$(readlink "$profile")
+generation1_target=$(readlink "$profile-1-link")
+generation2_target=$(readlink "$profile-2-link")
+current_bin_target=$(readlink "$profile/bin")
+current_store_path=$(dirname "$current_bin_target")
+profile_hello_output=$(PATH="$profile/bin:/bin:/usr/bin" hello)
+clean_env_hello_output=$(env -i PATH="$profile/bin:/bin:/usr/bin" HOME="$workdir/home" USER="${USER:-self}" LOGNAME="${LOGNAME:-self}" "$profile/bin/hello")
+user_uid=$(id -u)
+user_name=$(id -un)
+
+[ "$profile_target" = 'profile-2-link' ] || {
+  echo "unexpected current profile target: $profile_target" >&2
+  exit 1
+}
+[ "$current_store_path" = "$phase62_out" ] || {
+  echo "profile does not point at the expected current store path" >&2
+  exit 1
+}
+[ "$profile_hello_output" = 'Hello, world!' ] || {
+  echo "unexpected profile hello output: $profile_hello_output" >&2
+  exit 1
+}
+[ "$clean_env_hello_output" = 'Hello, world!' ] || {
+  echo "unexpected clean-env hello output: $clean_env_hello_output" >&2
+  exit 1
+}
+
+cat >"$metadata_file" <<EOF
+workdir=$workdir
+phase61_metadata=$phase61_metadata
+phase62_metadata=$phase62_metadata
+phase61_log=$phase61_log
+phase62_log=$phase62_log
+profile=$profile
+profile_target=$profile_target
+generation1_link=$profile-1-link
+generation1_target=$generation1_target
+generation1_store_path=$phase61_out
+generation2_link=$profile-2-link
+generation2_target=$generation2_target
+generation2_store_path=$phase62_out
+current_bin_target=$current_bin_target
+current_store_path=$current_store_path
+profile_hello_output=$profile_hello_output
+clean_env_hello_output=$clean_env_hello_output
+user_uid=$user_uid
+user_name=$user_name
+installation_mode=minimal-real-store-profile
+EOF
+
+if [ -n "$metadata_target" ]; then
+  mkdir -p "$(dirname "$metadata_target")"
+  cp "$metadata_file" "$metadata_target"
+fi
+
+printf 'PASS phase6-real-store-profile\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"