Initial commit: AirCoding V1.0.0 Alpha architecture baseline

Complete architecture document set with multi-model review remediation:
- Frozen interface contracts, runtime semantics, DB schemas
- Event/tool/error/provider registries
- Scheduler and main agent state machines
- C4 module/code views, solution architecture, baseline V1
- Multi-model review reports and joint assessment
- Phase-gate remediation complete (P0/P1/P2/UX resolved)
- Implementation plan with T-000A through T-045
- Reference folders kept as placeholders only

reference/openai-codex/.devcontainer/Dockerfile.secure

@@ -0,0 +1,82 @@
+FROM mcr.microsoft.com/devcontainers/base:ubuntu-24.04
+
+ARG TZ
+ARG DEBIAN_FRONTEND=noninteractive
+ARG NODE_MAJOR=22
+ARG RUST_TOOLCHAIN=1.92.0
+# Keep this in sync with .devcontainer/codex-install/package.json and pnpm-lock.yaml.
+ARG CODEX_NPM_VERSION=0.121.0
+
+ENV TZ="$TZ"
+ENV COREPACK_ENABLE_DOWNLOAD_PROMPT=0
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+# Devcontainers run as a non-root user, so enable bubblewrap's setuid mode.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        build-essential \
+        curl \
+        git \
+        ca-certificates \
+        pkg-config \
+        clang \
+        musl-tools \
+        libssl-dev \
+        libsqlite3-dev \
+        just \
+        python3 \
+        python3-pip \
+        jq \
+        less \
+        man-db \
+        unzip \
+        ripgrep \
+        fzf \
+        fd-find \
+        zsh \
+        dnsutils \
+        iproute2 \
+        ipset \
+        iptables \
+        aggregate \
+        bubblewrap \
+    && chmod u+s /usr/bin/bwrap \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY .devcontainer/codex-install/package.json \
+     .devcontainer/codex-install/pnpm-lock.yaml \
+     .devcontainer/codex-install/pnpm-workspace.yaml \
+     /opt/codex-install/
+
+RUN curl -fsSL "https://deb.nodesource.com/setup_${NODE_MAJOR}.x" | bash - \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends nodejs \
+    && test "$(node -p "require('/opt/codex-install/package.json').dependencies['@openai/codex']")" = "${CODEX_NPM_VERSION}" \
+    && cd /opt/codex-install \
+    && corepack pnpm install --prod --frozen-lockfile \
+    && ln -s /opt/codex-install/node_modules/.bin/codex /usr/local/bin/codex \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY .devcontainer/init-firewall.sh /usr/local/bin/init-firewall.sh
+COPY .devcontainer/post_install.py /opt/post_install.py
+COPY .devcontainer/post-start.sh /opt/post_start.sh
+
+RUN chmod 500 /usr/local/bin/init-firewall.sh \
+    && chmod 755 /opt/post_start.sh \
+    && chmod 644 /opt/post_install.py \
+    && chown vscode:vscode /opt/post_install.py
+
+RUN install -d -m 0775 -o vscode -g vscode /commandhistory /workspace \
+    && touch /commandhistory/.bash_history /commandhistory/.zsh_history \
+    && chown vscode:vscode /commandhistory/.bash_history /commandhistory/.zsh_history
+
+USER vscode
+ENV PATH="/home/vscode/.cargo/bin:${PATH}"
+WORKDIR /workspace
+
+RUN curl -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain "${RUST_TOOLCHAIN}" \
+    && rustup component add clippy rustfmt rust-src \
+    && rustup target add x86_64-unknown-linux-musl aarch64-unknown-linux-musl