diff --git a/.beads/issues.jsonl b/.beads/issues.jsonl
index ed24d7b..26630a0 100644
--- a/.beads/issues.jsonl
+++ b/.beads/issues.jsonl
@@ -57,7 +57,7 @@
 {"id":"ifcurl-5or","title":"README.md: library usage example doesn't show temp file pattern for ifcopenshell.open()","description":"The 'Use as a library' section shows 'model = ifcopenshell.open(...)   # write ifc_bytes to tmp file first' with a comment but no actual code. ifcopenshell.open() requires a file path, not bytes. A new user following the README will be stuck. The example should show the tempfile.mkstemp pattern used in _load_model() in service.py, or at least reference that function.","status":"closed","priority":3,"issue_type":"task","assignee":"Bruno Postle","owner":"bruno@postle.net","created_at":"2026-04-24T10:41:04Z","created_by":"Bruno Postle","updated_at":"2026-04-24T15:52:14Z","started_at":"2026-04-24T14:47:55Z","closed_at":"2026-04-24T15:52:14Z","close_reason":"Closed","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"id":"ifcurl-dyy","title":"viewer.html: BCF export from viewer omits component GUIDs — undocumented","description":"The viewer's client-side BCF export cannot include component GUIDs because it has no access to the IFC model's resolved GlobalIds. The service POST /bcf endpoint resolves the selector server-side and produces proper BCF with \u003cSelection\u003e or \u003cVisibility/Exceptions\u003e elements. This discrepancy is not documented anywhere. The viewer's BCF button should either show a note ('GUIDs not resolved — use /bcf API for full component selection') or redirect to the service endpoint when available.","status":"open","priority":3,"issue_type":"task","owner":"bruno@postle.net","created_at":"2026-04-24T10:40:49Z","created_by":"Bruno Postle","updated_at":"2026-04-24T10:40:49Z","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"id":"ifcurl-tq8","title":"No tests for ifcurl cache CLI subcommands","description":"The 'ifcurl cache list', 'ifcurl cache prune', and 'ifcurl cache clear' subcommands in __main__.py have no automated test coverage. _repo_cache_entries(), _evict_if_needed(), and _get_max_cache_bytes() have unit tests in test_git.py, but the CLI layer (_cmd_cache) is untested. Should add tests that exercise the argparse wiring, the output formatting, and the prune logic via subprocess or by calling _cmd_cache() directly with a fake args namespace.","status":"open","priority":3,"issue_type":"task","owner":"bruno@postle.net","created_at":"2026-04-24T10:40:45Z","created_by":"Bruno Postle","updated_at":"2026-04-24T10:40:45Z","dependency_count":0,"dependent_count":0,"comment_count":0}
-{"id":"ifcurl-ovi","title":"dev/compose.yml uses Forgejo v10, but go.patch targets v13","description":"dev/compose.yml pulls codeberg.org/forgejo/forgejo:10 for local development. The go.patch and ifc_url.go were written and tested against the v13 branch. Running the dev environment with v10 won't have the patched binary or the correct template slots. The compose file should either use the patched v13 build, or document that the stock container is for testing the service/viewer in isolation only, not for testing the Go patch.","status":"open","priority":3,"issue_type":"bug","owner":"bruno@postle.net","created_at":"2026-04-24T10:40:35Z","created_by":"Bruno Postle","updated_at":"2026-04-24T10:40:35Z","dependency_count":0,"dependent_count":0,"comment_count":0}
+{"id":"ifcurl-ovi","title":"dev/compose.yml uses Forgejo v10, but go.patch targets v13","description":"dev/compose.yml pulls codeberg.org/forgejo/forgejo:10 for local development. The go.patch and ifc_url.go were written and tested against the v13 branch. Running the dev environment with v10 won't have the patched binary or the correct template slots. The compose file should either use the patched v13 build, or document that the stock container is for testing the service/viewer in isolation only, not for testing the Go patch.","status":"closed","priority":3,"issue_type":"bug","assignee":"Bruno Postle","owner":"bruno@postle.net","created_at":"2026-04-24T10:40:35Z","created_by":"Bruno Postle","updated_at":"2026-04-25T09:05:41Z","started_at":"2026-04-25T09:05:21Z","closed_at":"2026-04-25T09:05:41Z","close_reason":"Updated image to v13 and added comment clarifying stock container doesn't include the IFC patch","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"id":"ifcurl-j35","title":"git.py: silent failure on mutable ref fetch serves stale data without warning","description":"In _open_remote(), when fetching for a mutable ref (branch/HEAD) fails — network error, auth failure, server down — the exception is caught and ignored ('pass # offline — use cached data'). The caller receives stale data with no indication anything went wrong. The render then proceeds, potentially showing outdated geometry. At minimum a log.warning should be emitted. Ideally the service response should include a header (e.g. X-Ifcurl-Cache: stale) so Forgejo or the browser viewer can surface a warning to the user.","status":"closed","priority":3,"issue_type":"bug","owner":"bruno@postle.net","created_at":"2026-04-24T10:40:31Z","created_by":"Bruno Postle","updated_at":"2026-04-25T08:05:18Z","closed_at":"2026-04-25T08:05:18Z","close_reason":"Closed","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"id":"ifcurl-69l","title":"License headers for Forgejo integration files","description":"The Go patch files (ifc_url.go, ifc_url_test.go) already carry MIT headers matching Forgejo's per-file convention. The JS/HTML assets have no license header: viewer.html, viewer-url.js, footer.tmpl. Review: (1) confirm MIT is correct for files intended for Forgejo contribution (Forgejo project is GPL-3.0 but individual contributed files use MIT); (2) check compatibility with ThatOpen components licence (viewer.html loads @thatopen/components from CDN); (3) add SPDX licence headers to the three unlicensed asset files. The Python/CLI core remains LGPL-3.0-or-later as it targets IfcOpenShell contribution.","status":"closed","priority":3,"issue_type":"task","owner":"bruno@postle.net","created_at":"2026-04-24T07:09:46Z","created_by":"Bruno Postle","updated_at":"2026-04-24T07:29:22Z","closed_at":"2026-04-24T07:29:22Z","close_reason":"Added MIT SPDX headers to viewer.html, viewer-url.js, footer.tmpl — ThatOpen components also MIT-licensed so no compatibility issue","dependency_count":0,"dependent_count":0,"comment_count":0}
 {"id":"ifcurl-8s8","title":"viewer.html: interactive tool to set clipping planes","description":"Currently clip= planes can only be set by hand-editing the URL. Add an interactive clipping tool to the viewer: a UI control (e.g. toolbar button) that lets the user drag/place a clipping plane against the loaded model. The plane position and normal should be written back into the ifc:// URL as clip= parameters so the view is shareable. Consider using ThatOpen's clipper component (OBC.Clipper) if available, or a Three.js-based approach.","status":"closed","priority":3,"issue_type":"feature","assignee":"Bruno Postle","owner":"bruno@postle.net","created_at":"2026-04-24T05:49:22Z","created_by":"Bruno Postle","updated_at":"2026-04-24T06:23:14Z","started_at":"2026-04-24T06:11:49Z","closed_at":"2026-04-24T06:23:14Z","close_reason":"setupClipper() uses OBC.Clipper: seeds URL planes as draggable SimplePlanes, toolbar '✂ clip' toggle for double-click placement, '⊗ clips' clear button. syncCameraUrl extended to serialise current planes back to URL.","dependency_count":0,"dependent_count":0,"comment_count":0}
diff --git a/dev/compose.yml b/dev/compose.yml
index 6f3f946..d7c4b38 100644
--- a/dev/compose.yml
+++ b/dev/compose.yml
@@ -1,6 +1,9 @@
 services:
   forgejo:
-    image: codeberg.org/forgejo/forgejo:10
+    # Stock Forgejo image — does NOT include the IFC patch from go.patch.
+    # Use this to test the preview service and viewer in isolation only.
+    # To test the Go patch itself, run the patched binary built from go.patch.
+    image: codeberg.org/forgejo/forgejo:13
     container_name: ifcurl-forgejo
     restart: unless-stopped
     ports: