docs(findings): note crash-during-download leaves orphan archives

While reviewing the cancel-cleanup fix (`fix(peer): delete partial files
when a download is cancelled`), it became clear that the new
`discard_cancelled_download` sweep only runs from inside the in-flight
orchestrator. If the process dies mid-download (kill, crash, power loss)
the partial `.eti` archives are left behind: `install::recover_on_startup`
calls `recover_download_transients`, which only removes
`.version.ini.tmp` and `.version.ini.discarded`. The user is left with
a card that looks "downloaded" but with corrupted archives that can only
be cleared via the explicit `Remove files` action.

Closing the gap would mean running the same discard pass during recovery
for any game root whose install intent is `None` and whose `version.ini`
is absent (intent log already distinguishes installed-and-then-broken
from interrupted-download). Not blocking — the user-initiated cancel
button is now correct in its scope; this is the symmetric crash recovery
case captured for a future cleanup pass.

Refs: c380046 (fix(peer): delete partial files when a download is cancelled)

FINDINGS.md

@@ -2,6 +2,20 @@
 
 ## Open
 
+### Crash-during-download leaves orphan archive files
+
+`crates/lanspread-peer/src/install/transaction.rs:329` — `recover_download_transients`
+sweeps only `.version.ini.tmp` and `.version.ini.discarded` on startup. The new
+cancel-cleanup (`download/storage.rs::discard_cancelled_download`) is only invoked
+from the in-flight orchestrator, so a crash mid-download leaves partial `.eti`
+archives in the game root. After restart the user sees a game that looks
+half-downloaded with no way to clean it up except `RemoveDownloadedGame`. Closing
+this would mean calling the same discard pass during recovery for any game root
+whose intent is `None` and whose `version.ini` is absent.
+
+Not blocking. The cancel-button fix is correct in its scope; this is the symmetric
+crash-recovery case.
+
 ### `handleErrorEvent` still writes status fields directly
 
 `crates/lanspread-tauri-deno-ts/src/hooks/useGames.ts:80-89` — the error