refactor: deconsolidate redox.patch into individual patches

The 556MB monolithic redox.patch was impossible to manage, unreviewable,
blocked GitHub pushes, and could only grow. This commit:

- Moves all 64 absorbed patches from absorbed/ to active use in base/
- Removes the absorbed/ directory (consolidation history is now PATCH-HISTORY.md)
- Removes the redox.patch symlink from recipes/core/base/
- Fixes all recipe symlinks to point to active patches (not absorbed/)
- Patches are now individually wired, reviewable, and independently rebasable

The redox.patch mega-file is no longer needed — individual patches
are applied directly from the recipe.toml patches list.

local/patches/base/PATCH-HISTORY.md

@@ -0,0 +1,28 @@
+# Absorbed Patches
+
+These patches have been **consolidated into `local/patches/base/redox.patch`** (the
+mega-patch applied automatically to the base recipe source tree).
+
+**Do not wire these patches into `recipes/core/base/recipe.toml`.** They are kept here
+for reference and git history only. If a patch referenced by a recipe.toml symlink
+breaks, that symlink should be updated to point to a current, active patch in
+`local/patches/base/` (NOT one in this directory).
+
+## Consolidation timeline
+
+| Date | Action |
+|------|--------|
+| 2026-04-30 | P0 + P2 patches consolidated into redox.patch |
+| 2026-04-30 | P1-P2 driver/ACPI patches consolidated |
+| 2026-04-30 | P3 ACPI/PCI patches absorbed |
+
+## Active patches (NOT in this directory)
+
+The active patches applied on top of `redox.patch` live in `local/patches/base/`:
+
+- `P3-ps2d-led-feedback.patch` — PS/2 LED state + InputProducer migration
+- `P3-inputd-keymap-bridge.patch` — InputProducer enum + keymap bridge
+- `P3-usbhidd-hardening.patch` — USB HID descriptor validation, retry, lookup table
+- `P3-init-colored-output.patch` — ANSI-colored init daemon output
+- `P9-fix-so-pecred.patch` — shared-object credential fix
+- `redox.patch` — cumulative mega-patch (applied first, automatically)