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>

src/types/agents.ts

@@ -0,0 +1,73 @@
+// Copyright (C) 2025 Keygraph, Inc.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License version 3
+// as published by the Free Software Foundation.
+
+/**
+ * Agent type definitions
+ */
+
+export type AgentName =
+  | 'pre-recon'
+  | 'recon'
+  | 'injection-vuln'
+  | 'xss-vuln'
+  | 'auth-vuln'
+  | 'ssrf-vuln'
+  | 'authz-vuln'
+  | 'injection-exploit'
+  | 'xss-exploit'
+  | 'auth-exploit'
+  | 'ssrf-exploit'
+  | 'authz-exploit'
+  | 'report';
+
+export type PromptName =
+  | 'pre-recon-code'
+  | 'recon'
+  | 'vuln-injection'
+  | 'vuln-xss'
+  | 'vuln-auth'
+  | 'vuln-ssrf'
+  | 'vuln-authz'
+  | 'exploit-injection'
+  | 'exploit-xss'
+  | 'exploit-auth'
+  | 'exploit-ssrf'
+  | 'exploit-authz'
+  | 'report-executive';
+
+export type PlaywrightAgent =
+  | 'playwright-agent1'
+  | 'playwright-agent2'
+  | 'playwright-agent3'
+  | 'playwright-agent4'
+  | 'playwright-agent5';
+
+export type AgentValidator = (sourceDir: string) => Promise<boolean>;
+
+export type AgentValidatorMap = Record<AgentName, AgentValidator>;
+
+export type McpAgentMapping = Record<PromptName, PlaywrightAgent>;
+
+export type AgentPhase =
+  | 'pre-recon'
+  | 'recon'
+  | 'vuln'
+  | 'exploit'
+  | 'report';
+
+export interface AgentDefinition {
+  name: AgentName;
+  promptName: PromptName;
+  phase: AgentPhase;
+  dependencies?: AgentName[];
+}
+
+export type AgentStatus =
+  | 'pending'
+  | 'in_progress'
+  | 'completed'
+  | 'failed'
+  | 'rolled-back';