feat(skills): add pdf-reader skill (#772)

Thanks @glifocat! Clean skill package — good docs, solid tests, nice intent files. Pushed a small fix for path traversal on the PDF filename before merging.

.claude/skills/add-pdf-reader/modify/container/Dockerfile

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+# NanoClaw Agent Container
+# Runs Claude Agent SDK in isolated Linux VM with browser automation
+
+FROM node:22-slim
+
+# Install system dependencies for Chromium and PDF tools
+RUN apt-get update && apt-get install -y \
+    chromium \
+    fonts-liberation \
+    fonts-noto-cjk \
+    fonts-noto-color-emoji \
+    libgbm1 \
+    libnss3 \
+    libatk-bridge2.0-0 \
+    libgtk-3-0 \
+    libx11-xcb1 \
+    libxcomposite1 \
+    libxdamage1 \
+    libxrandr2 \
+    libasound2 \
+    libpangocairo-1.0-0 \
+    libcups2 \
+    libdrm2 \
+    libxshmfence1 \
+    curl \
+    git \
+    poppler-utils \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set Chromium path for agent-browser
+ENV AGENT_BROWSER_EXECUTABLE_PATH=/usr/bin/chromium
+ENV PLAYWRIGHT_CHROMIUM_EXECUTABLE_PATH=/usr/bin/chromium
+
+# Install agent-browser and claude-code globally
+RUN npm install -g agent-browser @anthropic-ai/claude-code
+
+# Create app directory
+WORKDIR /app
+
+# Copy package files first for better caching
+COPY agent-runner/package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy source code
+COPY agent-runner/ ./
+
+# Build TypeScript
+RUN npm run build
+
+# Install pdf-reader CLI
+COPY skills/pdf-reader/pdf-reader /usr/local/bin/pdf-reader
+RUN chmod +x /usr/local/bin/pdf-reader
+
+# Create workspace directories
+RUN mkdir -p /workspace/group /workspace/global /workspace/extra /workspace/ipc/messages /workspace/ipc/tasks /workspace/ipc/input
+
+# Create entrypoint script
+# Secrets are passed via stdin JSON — temp file is deleted immediately after Node reads it
+# Follow-up messages arrive via IPC files in /workspace/ipc/input/
+RUN printf '#!/bin/bash\nset -e\ncd /app && npx tsc --outDir /tmp/dist 2>&1 >&2\nln -s /app/node_modules /tmp/dist/node_modules\nchmod -R a-w /tmp/dist\ncat > /tmp/input.json\nnode /tmp/dist/index.js < /tmp/input.json\n' > /app/entrypoint.sh && chmod +x /app/entrypoint.sh
+
+# Set ownership to node user (non-root) for writable directories
+RUN chown -R node:node /workspace && chmod 777 /home/node
+
+# Switch to non-root user (required for --dangerously-skip-permissions)
+USER node
+
+# Set working directory to group workspace
+WORKDIR /workspace/group
+
+# Entry point reads JSON from stdin, outputs JSON to stdout
+ENTRYPOINT ["/app/entrypoint.sh"]

.claude/skills/add-pdf-reader/modify/container/Dockerfile.intent.md

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+# Intent: container/Dockerfile modifications
+
+## What changed
+Added PDF reading capability via poppler-utils and a custom pdf-reader CLI script.
+
+## Key sections
+
+### apt-get install (system dependencies block)
+- Added: `poppler-utils` to the package list (provides pdftotext, pdfinfo, pdftohtml)
+- Changed: Comment updated to mention PDF tools
+
+### After npm global installs
+- Added: `COPY skills/pdf-reader/pdf-reader /usr/local/bin/pdf-reader` to copy CLI script
+- Added: `RUN chmod +x /usr/local/bin/pdf-reader` to make it executable
+
+## Invariants (must-keep)
+- All Chromium dependencies unchanged
+- agent-browser and claude-code npm global installs unchanged
+- WORKDIR, COPY agent-runner, npm install, npm run build sequence unchanged
+- Workspace directory creation unchanged
+- Entrypoint script unchanged
+- User switching (node user) unchanged
+- ENTRYPOINT unchanged