sdk: bootstrap standalone repo (P0)

- Dual license (LICENSE / LICENSE-MIT / LICENSE-APACHE) matching the crate manifests.
- ADRs 0001-0005: kernel base (direct 5.10->6.18.46 forward-port), tiered MC/DC,
  standalone repo, CI runner (3rd repo-scoped runner on 0640), driver source-of-truth.
- README goal 1 reconciled to the verified 6.18.46 forward-port (was stale plan44/6.6).
- Drop tracked build objects (*.o now gitignored).
- Capture the display (VOP dclk-pol + WIN1) and GT911 touch bring-up VERIFIED docs
  + capabilities-audit update from this session.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf

docs/decisions/0005-driver-source-of-truth.md

@@ -0,0 +1,21 @@
+# ADR 0005 — Hardened drivers live in warden-sdk/drivers/
+
+**Status:** Accepted (2026-08-25).
+
+## Context
+Our own hardware-facing driver code (relays, modbus master, RGA wrapper, HPMCU
+supervisor, devmem/reset ladder, freshness) is the Tier-1 MC/DC target, but it
+currently lives in flare-edge. The kernel driver source lives in an un-versioned
+scratch tree (`flare-edge/research/linux-6.18.46/`).
+
+## Decision
+Bring **hardened copies into `warden-sdk/drivers/`** as the canonical source-of-truth,
+each with its HAL seam and a 100% MC/DC host harness. The RV1106 kernel deltas are
+formalized as a patch series in `patches/`. flare-edge consumes warden-sdk later
+(separate, [maintainer]-gated step).
+
+## Consequences
+- Realizes the seam architecture (ADR-referenced in `docs/architecture.md`).
+- flare-edge is not edited now; a later integration step points flare-edge at these.
+- Risk: temporary duplication of shared constants between the two repos until the
+  integration lands — tracked, acceptable for the bring-up window.