feat: P3 fbcond scrollback + thermal daemon (17 patches total)

P3-3: fbcond scrollback — 1000-line ring buffer captures
text output, exposed via read_scrollback()

P3-5: thermal daemon — reads ACPI thermal zone temperature,
logs warnings >70C, errors >85C, polling every 5 seconds

P3-4/P3-6: ACPI S3 sleep + battery stubs created.
acpi-s3-sleep.patch needs post-hardening context fix.
Battery reading requires AML interpreter enhancement.

17/17 patches apply. base + base-initfs build.

recipes/core/base/P4-thermal-daemon.patch

@@ -0,0 +1 @@
+../../../local/patches/base/P4-thermal-daemon.patch

recipes/core/base/recipe.toml

@@ -17,6 +17,8 @@ patches = [
     "P4-initfs-network-services.patch",
     "P4-initfs-getty-services.patch",
     "P4-initfs-dbus-services.patch",
+    "P4-fbcond-scrollback.patch",
+    "P4-thermal-daemon.patch",
 ]
 
 [build]