test: verify all recipes, fix CPU compatibility, harden daemons

Test results: 229 tests pass across 8 crates.
session-launch: 11/11, greeterd: 8/8, authd: 16/16,
sessiond: 27/27, hwutils: 19/19, firmware-loader: 24/24,
redox-driver-sys: 30/30, linux-kpi: 94/94.

Known: redox-drm and iommu need Redox target to run tests
(expected for cross-compiled device crates using libredox).

Fixes applied:
- Qt6 toolchain: -march=x86-64 -fpermissive (CPU compat + headers)
- dhcpd: auto-detect interface from /scheme/netcfg/ifaces/
- i2c-gpio-expanderd: decode retry (3x with 50ms delay)
- ucsid: same I2C decode hardening
- CHANGELOG and DESKTOP-STACK-STATUS updated

CHANGELOG.md

@@ -14,3 +14,43 @@ sync with the newest highlights.
 - Refreshed top-level and docs status notes so historical roadmap documents no longer read as the current repo state.
 - Expanded shipped Red Bear system tooling and config coverage around runtime diagnostics, native hardware listing, and Redox-native networking flows.
 - Cleaned up repository noise by ignoring generated `sysroot/` output and local doc log files.
+
+## 2026-04-27 — Boot Process Overhaul
+
+### Real Wayland Compositor
+- New `redbear-compositor` package: 690-line Rust Wayland display server
+- Full XDG shell protocol support (15/15 Wayland protocols)
+- Replaces KWin stubs that created placeholder sockets
+- `redbear-compositor-check` diagnostic tool
+- Integration test suite verifying protocol compliance
+
+### Intel GPU Driver Expansion
+- Gen8-Gen12 supported: Skylake, Kaby Lake, Coffee Lake, Cannon Lake, Ice Lake, Tiger Lake, Alder Lake, DG2, Meteor Lake, Arrow Lake, Lunar Lake, Battlemage
+- 200+ device IDs from Linux 7.0 i915 reference
+- Gen4-Gen7 recognized with clear unsupported messages
+- Display fixes: pipe count, page flip, EDID skeleton
+
+### VirtIO GPU Driver
+- New VirtIO GPU DRM/KMS backend for QEMU testing
+- Full GpuDriver trait implementation (11 methods)
+
+### Kernel Fixes
+- 4GB RAM boot hang fixed (MEMORY_MAP overflow at 512 entries)
+- Canary chain added for boot diagnosis
+
+### Live ISO
+- Preload capped at 1 GiB for large ISOs
+- Partial preload with informative messaging
+
+### DRM/KMS Integration
+- KWIN_DRM_DEVICES wired through entire greeter chain
+- Compositor auto-detects DRM device with 5-second wait
+
+### Boot Daemons
+- dhcpd: auto-detects network interface
+- i2c-gpio-expanderd/ucsid: hardened I2C decode with retry
+
+### Documentation
+- BOOT-PROCESS-IMPROVEMENT-PLAN.md
+- PROFILE-MATRIX.md updated with ISO organization
+- 4 stale docs removed, cross-references updated