Test Shotty screenshot copies through native Decky RPC (#392)

* Test Shotty screenshot copies through native Decky RPC

* Clarify local Shotty RPC evidence limit

---------

Co-authored-by: SAPHID <saphid@users.noreply.github.com>

docs/evidence/framey-shotty-rpc-2026-10-28.md

@@ -0,0 +1,27 @@
+# Shotty screenshot copy through native Decky RPC, 28 October 2026
+
+The exact official Shotty 0.1.0 archive (store ID 53, SHA-256
+`ab7f6618b264a0cb766525e788cef6c3e1478c0fef98a701225e5e8af441e2fe`)
+was installed with Frame Control's digest-scoped `shotty-click-app-dir` shim.
+The local `scripts/framey-test-decky-runtime.py` run used the published,
+digest-verified Decky 3.3.0 amd64 loader in a disposable unprivileged container
+with no network, host devices or writable host mount. Its full 14-case native
+suite, including three negative controls, exited successfully.
+
+The Shotty case placed two small marker files under a private synthetic Steam
+screenshots directory in the container's temporary home. Calls went through
+Decky's real legacy websocket RPC. `set_id_map_fronend` supplied a private game
+name; `copy_screenshot` returned `true` for the selected file. Independent
+reads of `Pictures/Screenshots/Private Game/selected.jpg` and
+`Pictures/Screenshots/most_recent.jpg` matched the marker bytes. A later
+`aggregate_all` returned `1`, and the historical file in the named folder
+also matched its source bytes. Empty aggregation and `was_rescued=false` still
+passed. The runner removed its owned containers and image; no headset or user
+screenshot was accessed.
+
+This local run checks the real Decky RPC and same-filesystem copy path with
+synthetic files on amd64. The PR's hosted native ARM64 gate must pass before
+merge; this local result alone does not establish ARM64 behavior. Steam's live
+screenshot notification, cross-filesystem copies, the continuous rescuer, real
+Frame installation, wearer-visible VR and physical controller use remain
+unverified. Shotty remains **partial**.

tests/decky-runtime/check.py

@@ -358,7 +358,22 @@ def main():
                 assert case['probe'] == 'screenshots'
                 assert legacy('was_rescued') is False
                 assert legacy('aggregate_all', allapps=[]) == 0
-                report['result'] = 'discovery, backend import and empty screenshot aggregation passed'
+                screenshots = home/'.local/share/Steam/userdata/9001/760/remote/4242/screenshots'
+                screenshots.mkdir(parents=True)
+                marker = b'Framey private screenshot fixture\n'
+                (screenshots/'selected.jpg').write_bytes(marker)
+                legacy('set_id_map_fronend', allapps=[[4242, 'Private Game']])
+                assert legacy('copy_screenshot', app_id=4242,
+                              url='https://localhost/selected.jpg') is True
+                copied = home/'Pictures/Screenshots/Private Game/selected.jpg'
+                assert copied.read_bytes() == marker
+                assert (home/'Pictures/Screenshots/most_recent.jpg').read_bytes() == marker
+                (screenshots/'historical.jpg').write_bytes(b'Framey historical fixture\n')
+                assert legacy('aggregate_all', allapps=[[4242, 'Private Game']]) == 1
+                assert (copied.parent/'historical.jpg').read_bytes() == b'Framey historical fixture\n'
+                assert legacy('was_rescued') is False
+                report['result'] = ('discovery, backend import, empty aggregation, private screenshot '
+                                    'copy and historical aggregation passed')
             log.flush()
             log.seek(0)
             assert 'Starting Decky version v3.3.0' in log.read()