feat: typescript migration (#40)

* chore: initialize TypeScript configuration and build setup

- Add tsconfig.json for root and mcp-server with strict type checking
- Install typescript and @types/node as devDependencies
- Add npm build script for TypeScript compilation
- Update main entrypoint to compiled dist/shannon.js
- Update Dockerfile to build TypeScript before running
- Configure output directory and module resolution for Node.js

* refactor: migrate codebase from JavaScript to TypeScript

- Convert all 37 JavaScript files to TypeScript (.js -> .ts)
- Add type definitions in src/types/ for agents, config, errors, session
- Update mcp-server with proper TypeScript types
- Move entry point from shannon.mjs to src/shannon.ts
- Update tsconfig.json with rootDir: "./src" for cleaner dist output
- Update Dockerfile to build TypeScript before runtime
- Update package.json paths to use compiled dist/shannon.js

No runtime behavior changes - pure type safety migration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* docs: update CLI references from ./shannon.mjs to shannon

- Update help text in src/cli/ui.ts
- Update usage examples in src/cli/command-handler.ts
- Update setup message in src/shannon.ts
- Update CLAUDE.md documentation with TypeScript file structure
- Replace all ./shannon.mjs references with shannon command

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: remove unnecessary eslint-disable comments

ESLint is not configured in this project, making these comments redundant.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -108,18 +108,25 @@ RUN addgroup -g 1001 pentest && \
 # Set working directory
 WORKDIR /app
 
-# Copy package.json and package-lock.json first for better caching
+# Copy package files first for better caching
 COPY package*.json ./
+COPY mcp-server/package*.json ./mcp-server/
 
-# Install Node.js dependencies as root
-RUN npm ci --only=production && \
-    npm install -g zx && \
-    npm install -g @anthropic-ai/claude-agent-sdk && \
+# Install Node.js dependencies (including devDependencies for TypeScript build)
+RUN npm ci && \
+    cd mcp-server && npm ci && cd .. && \
     npm cache clean --force
 
-# Copy application code
+# Copy application source code
 COPY . .
 
+# Build TypeScript (mcp-server first, then main project)
+RUN cd mcp-server && npm run build && cd .. && npm run build
+
+# Remove devDependencies after build to reduce image size
+RUN npm prune --production && \
+    cd mcp-server && npm prune --production
+
 # Create directories for session data and ensure proper permissions
 RUN mkdir -p /app/sessions /app/deliverables /app/repos /app/configs && \
     mkdir -p /tmp/.cache /tmp/.config /tmp/.npm && \
@@ -127,8 +134,7 @@ RUN mkdir -p /app/sessions /app/deliverables /app/repos /app/configs && \
     chmod 777 /tmp/.cache && \
     chmod 777 /tmp/.config && \
     chmod 777 /tmp/.npm && \
-    chown -R pentest:pentest /app && \
-    chmod +x /app/shannon.mjs
+    chown -R pentest:pentest /app
 
 # Switch to non-root user
 USER pentest
@@ -148,4 +154,4 @@ ENV XDG_CACHE_HOME=/tmp/.cache
 ENV XDG_CONFIG_HOME=/tmp/.config
 
 # Set entrypoint
-ENTRYPOINT ["./shannon.mjs"]
+ENTRYPOINT ["node", "dist/shannon.js"]