docs: mark session-aware follow-ups #2 (switch input) + #3 (vout primary) resolved

Both landed in 3363576 and validated live on the Bazzite F44 box: a Gaming→Desktop
mid-stream switch shows `settled desktop portal env … compositor=kwin` →
`portal granted devices` → `device RESUMED` (input lands, no reconnect), and
`KWin: streamed output set as the sole desktop also_disabled=["HDMI-A-1"]` (panels
on the streamed screen). Remaining: #1 (F44 gamescope teardown GPU leak) + the
lower-priority polish.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/session-aware-host-followups.md

@@ -8,10 +8,20 @@ backend in place without a reconnect.
 
 Live-validated on the Bazzite F44 box (`bazzite-deck-nvidia:testing`, RTX 4090): Desktop KDE at
 5120×1440 + input; Gaming managed at 5120×1440; warm-session reuse on quick reconnect; Feature B
-video-switch both directions. The items below are **deliberately parked** — they have workarounds
+video-switch both directions.
-and/or are F44-specific.
 
-## High priority
+## Resolved (2026-06-15, `3363576`)
+
+- **#2 — mid-stream-switch input** ✅ `vdisplay::settle_desktop_portal()` pushes the live session env
+  into the systemd/D-Bus activation environment and restarts the KWin portal on a switch, so input
+  lands without a reconnect. Validated live: `settled desktop portal env … compositor=kwin` →
+  `libei: portal granted devices` → `device RESUMED` on a Gaming→Desktop mid-stream switch.
+- **#3 — KWin/Mutter virtual output primary** ✅ `apply_session_env` defaults
+  `PUNKTFUNK_KWIN_VIRTUAL_PRIMARY` / `PUNKTFUNK_MUTTER_VIRTUAL_PRIMARY` on for the auto desktop path.
+  Validated live: `KWin: streamed output set as the sole desktop also_disabled=["HDMI-A-1"]` — panels
+  now render on the streamed screen.
+
+## Still parked
 
 ### 1. F44 gamescope teardown corrupts the GPU context
 Every gamescope teardown on this box (stop the autologin on connect; stop the managed session on
@@ -31,26 +41,7 @@ but don't eliminate it. Options, in order of preference:
   connected (the autologin is never restored; return to gaming manually).
 - Upstream gamescope/driver fix.
 
-### 2. Mid-stream-switch input (Gaming→Desktop) is flaky until a reconnect
+(#2 mid-stream-switch input and #3 virtual-output-primary are **resolved** — see the Resolved section above.)
-After a mid-stream switch to a desktop, pointer/keyboard often don't land until a disconnect+reconnect.
-Root cause: on the switch the host opens the KDE `RemoteDesktop` **portal** immediately, but the
-portal is a D-Bus-activated service that reads the **systemd `--user` activation environment**, which
-hasn't settled to the new session yet — so the portal session is created against a half-stale env. It
-*accepts* events (no error, so the injector's reopen-on-failure never fires) but they don't reach
-KDE. The host log even shows `libei: portal granted devices` + `device RESUMED`, yet input is dead.
-**Workaround: reconnect once after switching** (re-opens the portal against the settled env → works).
-Fix: on a session switch, push the new session env into the systemd/D-Bus activation environment
-before reopening input — `systemctl --user import-environment WAYLAND_DISPLAY XDG_CURRENT_DESKTOP
-DBUS_SESSION_BUS_ADDRESS` + `dbus-update-activation-environment` (exactly what a fresh KDE login does;
-see `scripts/headless/run-headless-kde.sh:118-119`) — and/or delay/retry the input reopen until the
-portal is settled.
-
-### 3. KWin virtual output is not set as primary
-The KWin virtual output isn't marked the primary display, so KDE panels / primary-screen content can
-stay on the (now-absent) original output instead of the streamed virtual screen. Follow-up: set the
-virtual output primary on create — `vdisplay/kwin.rs` already reads `PUNKTFUNK_KWIN_VIRTUAL_PRIMARY`;
-make it default-on (or always promote the new output to primary via the KWin/kscreen API) so the
-streamed screen is the primary desktop.
 
 ## Lower priority / polish