refactor: remove ~275 lines of dead code and enable stricter tsconfig

- Delete unused src/cli/ui.ts, remove zod dependency, drop 4 dead functions (logError, handleToolError, getRetryDelay, displayTimingSummary)
- Remove 8 unused types/interfaces and 3 duplicate formatting utils from audit/utils.ts
- Narrow export surface: make 7 message-handler functions private, remove unused audit re-exports, unexport AgentDefinition and path constants
- Remove unused runClaudePrompt params (sessionMetadata, attemptNumber) and update caller
- Enable tsconfig noUnusedLocals, noUnusedParameters, noImplicitReturns, noImplicitOverride, noFallthroughCasesInSwitch

src/utils/metrics.ts

@@ -4,9 +4,6 @@
 // it under the terms of the GNU Affero General Public License version 3
 // as published by the Free Software Foundation.
 
-import chalk from 'chalk';
-import { formatDuration } from './formatting.js';
-
 // Timing utilities
 
 export class Timer {
@@ -59,52 +56,3 @@ export const costResults: CostResults = {
   total: 0,
 };
 
-// Function to display comprehensive timing summary
-const displayTimingSummary = (): void => {
-  if (!timingResults.total) {
-    console.log(chalk.yellow('No timing data available'));
-    return;
-  }
-
-  const totalDuration = timingResults.total.stop();
-
-  console.log(chalk.cyan.bold('\n⏱️  TIMING SUMMARY'));
-  console.log(chalk.gray('─'.repeat(60)));
-
-  // Total execution time
-  console.log(chalk.cyan(`📊 Total Execution Time: ${formatDuration(totalDuration)}`));
-  console.log();
-
-  // Agent breakdown
-  if (Object.keys(timingResults.agents).length > 0) {
-    console.log(chalk.magenta.bold('🤖 Agent Breakdown:'));
-    let agentTotal = 0;
-    for (const [agent, duration] of Object.entries(timingResults.agents)) {
-      const percentage = ((duration / totalDuration) * 100).toFixed(1);
-      const displayName = agent.replace(/-/g, ' ');
-      console.log(
-        chalk.magenta(
-          `  ${displayName.padEnd(20)} ${formatDuration(duration).padStart(8)} (${percentage}%)`
-        )
-      );
-      agentTotal += duration;
-    }
-    console.log(
-      chalk.gray(
-        `  ${'Agents Total'.padEnd(20)} ${formatDuration(agentTotal).padStart(8)} (${((agentTotal / totalDuration) * 100).toFixed(1)}%)`
-      )
-    );
-  }
-
-  // Cost breakdown
-  if (Object.keys(costResults.agents).length > 0) {
-    console.log(chalk.green.bold('\n💰 Cost Breakdown:'));
-    for (const [agent, cost] of Object.entries(costResults.agents)) {
-      const displayName = agent.replace(/-/g, ' ');
-      console.log(chalk.green(`  ${displayName.padEnd(20)} $${cost.toFixed(4).padStart(8)}`));
-    }
-    console.log(chalk.gray(`  ${'Total Cost'.padEnd(20)} $${costResults.total.toFixed(4).padStart(8)}`));
-  }
-
-  console.log(chalk.gray('─'.repeat(60)));
-};