Integrate FreeBSD image generation with system layer

docs/reports/phase8-system-image-freebsd.md

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+# Phase 8.2: Image generation integrated with the Fruix system definition layer
+
+Date: 2026-04-01
+
+## Summary
+
+This step moves bhyve-image generation out of a detached shell-only path and into the declarative Fruix FreeBSD system-composition module.
+
+Added files:
+
+- `tests/system/materialize-phase8-system-image.scm`
+- `tests/system/run-phase8-system-image.sh`
+
+Updated file:
+
+- `modules/fruix/system/freebsd.scm`
+
+## Validation command
+
+Run command:
+
+```sh
+METADATA_OUT=/tmp/phase8-system-image-metadata.txt \
+./tests/system/run-phase8-system-image.sh
+```
+
+## What changed in the system layer
+
+The FreeBSD system module now exports image-oriented operations including:
+
+- `operating-system-image-spec`
+- `materialize-bhyve-image`
+
+The integrated image path now:
+
+1. starts from a declarative Fruix operating-system object
+2. materializes the system closure under `/frx/store`
+3. materializes a rootfs from that closure
+4. stages the closure and its reference closure into `rootfs/frx/store`
+5. builds:
+   - `esp.img`
+   - `root.ufs`
+   - `disk.img`
+6. stores the resulting image artifact as a content-addressed store item under `/frx/store`
+
+## Observed results
+
+Observed metadata included:
+
+- `image_store_path=/frx/store/...-fruix-bhyve-image-fruix-freebsd`
+- `disk_image=/frx/store/...-fruix-bhyve-image-fruix-freebsd/disk.img`
+- `closure_path=/frx/store/...-fruix-system-fruix-freebsd`
+- `raw_sha256=ac57d4c694ea3cf6b1bd24be48982090a6cfcfa301d052c1f903636a46f2d56e`
+- `image_size_bytes=335578624`
+- `store_item_count=13`
+- `esp_fstype=msdosfs`
+- `root_fstype=ufs`
+- `run_current_system_target=/frx/store/...-fruix-system-fruix-freebsd`
+- `boot_loader_target=/run/current-system/boot/loader`
+- `rc_conf_target=/run/current-system/etc/rc.conf`
+- `rc_script_target=/run/current-system/usr/local/etc/rc.d/fruix-shepherd`
+- `image_generation_mode=declarative-system-layer`
+
+## Important findings
+
+- image generation is now a direct output of the Fruix FreeBSD system-definition layer rather than an external follow-up script around Phase 7 artifacts
+- the resulting image artifact is itself stored under `/frx/store`, preserving the project’s store-centered composition story as the work moves from closures to VM images
+- rerunning `materialize-bhyve-image` for the same operating-system description produced the same image store path, which is the current prototype proof that the declarative system object can drive image generation end-to-end
+- the integrated image still passes the same static boot-structure checks used in Phase 8.1:
+  - GPT layout
+  - EFI partition contents
+  - UFS root partition
+  - serial-console loader configuration
+  - `run/current-system` topology
+
+## Conclusion
+
+Phase 8.2 is satisfied on the current FreeBSD prototype track:
+
+- a single declarative Fruix operating-system description can now drive image generation end-to-end
+- the result is a bhyve-oriented raw image artifact stored under `/frx/store`
+- Phase 8 as a whole is now complete on the active FreeBSD amd64 prototype path