docs(agent): propose 3 even deeper-dive workstation tasks

- [usefulness] Screen Sharing for Legacy X11 Apps (xwaylandvideobridge)
- [stability] Magic SysRq Keys for Safe Recovery (kernel.sysrq)
- [usefulness] File Manager Archive Backend (file-roller)

agent/BACKLOG.md

@@ -383,6 +383,29 @@ implement. Bernardo moves accepted items into a tier.*
   provides early warnings when an NVMe/SSD starts throwing SMART errors, giving
   the user a critical window to back up data before the drive dies.
 
+- **[usefulness] Screen Sharing for Legacy X11 Apps (`xwaylandvideobridge`)**:
+  Native Wayland screen sharing works via PipeWire and the desktop portal,
+  but apps running via XWayland (like older Electron apps, Discord, or Slack)
+  cannot capture the Wayland desktop directly. Adding `xwaylandvideobridge`
+  invisibly routes Wayland window/screen streams into a virtual X11 window
+  that these legacy apps can read, instantly fixing the "black screen" issue
+  when sharing screens.
+
+- **[stability] Magic SysRq Keys for Safe Recovery (`kernel.sysrq = 1`)**:
+  If the Wayland compositor crashes or the GPU driver hangs, the desktop
+  completely freezes. The standard fallback is holding the power button,
+  which risks BTRFS data corruption. Enabling `boot.kernel.sysctl."kernel.sysrq" = 1`
+  allows the kernel to intercept the Alt+SysRq+REISUB key sequence to safely
+  terminate processes, sync disks, gracefully unmount filesystems, and reboot
+  even when userspace is dead. This is a critical safety net.
+
+- **[usefulness] File Manager Archive Backend (`file-roller` or `xarchiver`)**:
+  Thunar is configured with `thunar-archive-plugin` in the system module, but
+  the underlying archive extraction GUI backend is missing. Consequently,
+  right-clicking a `.zip` or `.tar.gz` file and clicking "Extract Here" will
+  fail silently. Adding an archive manager fulfills a fundamental workstation
+  requirement and fixes the broken context menu.
+
 ## Decisions `[human]`
 
 Open calls only Bernardo can make; agents add options/evidence but never

agent/JOURNAL.md

@@ -17,9 +17,9 @@ Template:
 
 ---
 
-## 2026-07-08 — Stability + usefulness survey → 6 PROPOSED (iteration #74)
+## 2026-07-08 — Stability + usefulness survey → 9 PROPOSED (iteration #74)
 - **Task:** Bernardo requested new actionable items for stability and workstation feature-completeness, including a deeper dive.
-- **Did:** Researched the codebase for gaps. Pitched six new PROPOSED items: BTRFS auto-scrub, udiskie automounter, ddcutil external display control, pcscd+u2f security key support, easyeffects mic noise cancellation, and smartd drive health monitoring.
+- **Did:** Researched the codebase for gaps. Pitched nine new PROPOSED items: BTRFS auto-scrub, udiskie automounter, ddcutil external display control, pcscd+u2f security key support, easyeffects mic noise cancellation, smartd drive health monitoring, xwaylandvideobridge for legacy screen sharing, Magic SysRq keys for safe crash recovery, and file-roller/xarchiver for Thunar's broken extract menu.
 - **Verified:** n/a (research only).
 - **Pending:** awaiting Bernardo's triage to elevate to the active queue.
 - **Next suggestion:** triage the PROPOSED items.