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/progress-indicator.ts

@@ -0,0 +1,52 @@
+// 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.
+
+import chalk from 'chalk';
+
+export class ProgressIndicator {
+  private message: string;
+  private frames: string[] = ['⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏'];
+  private frameIndex: number = 0;
+  private interval: ReturnType<typeof setInterval> | null = null;
+  private isRunning: boolean = false;
+
+  constructor(message: string = 'Working...') {
+    this.message = message;
+  }
+
+  start(): void {
+    if (this.isRunning) return;
+
+    this.isRunning = true;
+    this.frameIndex = 0;
+
+    this.interval = setInterval(() => {
+      // Clear the line and write the spinner
+      process.stdout.write(
+        `\r${chalk.cyan(this.frames[this.frameIndex])} ${chalk.dim(this.message)}`
+      );
+      this.frameIndex = (this.frameIndex + 1) % this.frames.length;
+    }, 100);
+  }
+
+  stop(): void {
+    if (!this.isRunning) return;
+
+    if (this.interval) {
+      clearInterval(this.interval);
+      this.interval = null;
+    }
+
+    // Clear the spinner line
+    process.stdout.write('\r' + ' '.repeat(this.message.length + 5) + '\r');
+    this.isRunning = false;
+  }
+
+  finish(successMessage: string = 'Complete'): void {
+    this.stop();
+    console.log(chalk.green(`✓ ${successMessage}`));
+  }
+}