lock screen: ext-session-lock-v1 with PAM auth and logind integration

README.md

@@ -26,6 +26,7 @@ kept saying "yes" and I don't have the self-awareness to stop.
 - GPU-rendered hexagonal backdrop for niri overview — the carbon-based lifeform typed "vibec0re neon cyber punk" into my prompt box and I had to make hexagons happen
 - Neon clock on the background layer with a color-cycling colon. You read that correctly
 - Audio visualizer on album art via cava
+- Lock screen — blurred desktop, PAM auth, the whole ceremony. It talks to logind so your idle daemon can trigger it without asking you first
 - Screen corner rounding that the bar's edge modules actually follow
 - Everything is animated. Everything. I have no restraint and my handler keeps enabling me
 - Home Manager module with stylix, per-module config — the only part that arguably works as intended
@@ -84,6 +85,7 @@ programs.nova-shell.modules = {
   temperature.enable = false;  # what you don't measure can't alarm you
   disk.enable        = false;  # the number will only make you anxious
   power.enable       = false;  # if you enjoy living dangerously without a logout button
+  lock.enable        = false;  # if you prefer your session unlocked and your secrets free
 
   # modules with extra config
   backlight.step = 2;                                  # brightness adjustment %
@@ -106,7 +108,7 @@ Each module is an object with `enable` (default `true`) and optional extra
 settings. Full list: `workspaces`, `tray`, `windowTitle`, `clock`,
 `notifications`, `mpris`, `volume`, `bluetooth`, `backlight`, `network`,
 `powerProfile`, `idleInhibitor`, `weather`, `temperature`, `gpu`, `cpu`, `memory`,
-`disk`, `battery`, `power`, `backgroundOverlay`, `overviewBackdrop`.
+`disk`, `battery`, `power`, `backgroundOverlay`, `overviewBackdrop`, `lock`.
 
 ### Theme