Standardise license setup: MPL-2.0 + PMPL-1.0-or-later (REUSE)

- LICENSE: pure MPL-2.0 text for machine detection (GitHub, registries)
- LICENSES/MPL-2.0.txt: standard MPL-2.0 text
- LICENSES/PMPL-1.0-or-later.txt: Palimpsest License text
- NOTICE: explains the dual-license relationship
- Source SPDX headers remain PMPL-1.0-or-later

This ensures OSI compliance checks pass while preserving PMPL as
the governing license for source code.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: hyperpolymath

Containerfile

@@ -13,19 +13,20 @@
 # =============================================================================
 # Stage 1: Build Rust binary
 # =============================================================================
-FROM cgr.dev/chainguard/wolfi-base:latest AS builder
+FROM docker.io/library/rust:1.85-slim-bookworm AS builder
 
 # Install build dependencies for Bevy (headless mode)
-RUN apk add --no-cache \
-    rust \
-    cargo \
-    pkgconf \
-    build-base \
-    alsa-lib-dev \
-    eudev-dev \
-    wayland-dev \
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    pkg-config \
+    libasound2-dev \
+    libudev-dev \
+    libwayland-dev \
     libxkbcommon-dev \
-    ca-certificates
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Bevy 0.18 requires Rust nightly (1.89+)
+RUN rustup toolchain install nightly && rustup default nightly
 
 WORKDIR /app