Boot Fruix from distinct FreeBSD source revisions

docs/PROGRESS.md

@@ -1,5 +1,53 @@
 # Progress
 
+## 2026-04-03 — Phase 17.2 completed: Fruix now boots systems from distinct declared FreeBSD source revisions
+
+Completed work:
+
+- added boot validation harness:
+  - `tests/system/run-phase17-source-revisions-qemu.sh`
+- the new harness renders the Phase 17 Git and `src.txz` operating-system templates and boots both systems through the validated:
+  - QEMU
+  - UEFI
+  - TCG
+  - `shepherd-pid1`
+  path
+- validated booted source identities:
+  - Git source:
+    - ref: `stable/15`
+    - commit: `332708a606f6bf0841c1d4a74c0d067f5640fe89`
+  - `src.txz` source:
+    - `https://download.freebsd.org/releases/amd64/15.0-RELEASE/src.txz`
+    - sha256:
+      - `83c3e8157b6d7afcae57167fda75693bf1e5f581ca149a6ecb2d398b71bdfab0`
+- confirmed image/build metadata for both boots records:
+  - declared source kind
+  - ref/commit or archive URL/sha256
+  - materialized source store path
+  - distinct native base store sets
+- wrote:
+  - `docs/reports/phase17-source-revision-boots-freebsd.md`
+
+Validation:
+
+- `PASS phase17-source-revisions-qemu`
+- validated distinct booted closures:
+  - Git:
+    - `/frx/store/d6cbcc76f57fa9c392a80fe20e7499f7a837aab4fb96ea056e624cde95bc70c8-fruix-system-fruix-freebsd`
+  - `src.txz`:
+    - `/frx/store/02268e19930facb32e12b6ec191f2e5704d1e81033baf3637a889ad15924ff88-fruix-system-fruix-freebsd`
+- validated both guests reached the validated runtime state:
+  - Shepherd as PID 1
+  - `sshd` running
+- validated distinct materialized source stores and distinct native kernel/bootloader/runtime outputs for the two boots
+
+Current assessment:
+
+- Phase 17.2 is complete
+- Fruix can now both build **and boot** systems from distinct declared FreeBSD source revisions
+- the next step is Phase 17.3:
+  - document the intended policy for source provenance, caching, invalidation, and update semantics before installation work depends on it
+
 ## 2026-04-03 — Phase 17.1 completed: side-by-side FreeBSD source revisions now coexist in `/frx/store`
 
 Completed work: