feat: add kernel ACPI support for querying battery percentage, add battery indicator to desktop, move log state to 0:/state directory

kernel/src/Sched/Scheduler.hpp

@@ -18,7 +18,12 @@ namespace Sched {
     // every slot uniformly -- the primary/sibling distinction matters only
     // for resource ownership on exit.
     static constexpr int MaxProcesses = 256;
-    static constexpr uint64_t StackPages = 4;  // 16 KiB kernel stack per thread
+    // 64 KiB kernel stack per thread. The AML interpreter is the driver of
+    // this size: it runs on the calling thread's stack when a syscall asks for
+    // battery status, and firmware methods nest deeply through frames that
+    // carry 256-byte path buffers and 272-byte AML objects. See
+    // AML::StackBudget, which must stay comfortably under this.
+    static constexpr uint64_t StackPages = 16;
     static constexpr uint64_t StackSize = StackPages * 0x1000;
     static constexpr uint64_t UserStackPages = 8;  // 32 KiB user stack (main thread, eagerly mapped)
     static constexpr uint64_t UserStackSize = UserStackPages * 0x1000;