feat(mod_logger): add centralized TsBuildLogger and replace ad-hoc console output with structured, colored logging

ts/mod_logger/classes.logger.ts

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+/**
+ * Centralized console output for tsbuild.
+ *
+ * Visual hierarchy (4 levels):
+ *   HEADER  — top-level section start (emoji + bold text + separator line)
+ *   STEP    — major action within a section (emoji + text, no indent)
+ *   DETAIL  — supplementary info under a step (3-space indent + emoji + text)
+ *   SUCCESS/ERROR/WARN — outcome indicators (emoji + text, no indent)
+ */
+export class TsBuildLogger {
+  static readonly c = {
+    reset: '\x1b[0m',
+    bold: '\x1b[1m',
+    dim: '\x1b[2m',
+    red: '\x1b[31m',
+    green: '\x1b[32m',
+    yellow: '\x1b[33m',
+    cyan: '\x1b[36m',
+    white: '\x1b[37m',
+    brightRed: '\x1b[91m',
+    brightGreen: '\x1b[92m',
+    brightYellow: '\x1b[93m',
+  };
+
+  static readonly SEPARATOR_WIDTH = 70;
+
+  static separator(char = '─'): string {
+    return char.repeat(this.SEPARATOR_WIDTH);
+  }
+
+  /** Level 1: Section header. Blank line before, separator after. */
+  static header(emoji: string, text: string): void {
+    console.log('');
+    console.log(`${emoji} ${this.c.bold}${text}${this.c.reset}`);
+    console.log(this.c.dim + this.separator() + this.c.reset);
+  }
+
+  /** Level 2: Step within a section. No indent. */
+  static step(emoji: string, text: string): void {
+    console.log(`${emoji} ${text}`);
+  }
+
+  /** Level 3: Detail under a step. 3-space indent. */
+  static detail(emoji: string, text: string): void {
+    console.log(`   ${emoji} ${text}`);
+  }
+
+  /** Outcome: success */
+  static success(text: string): void {
+    console.log(`${this.c.green}✅ ${text}${this.c.reset}`);
+  }
+
+  /** Outcome: error (goes to stderr) */
+  static error(text: string): void {
+    console.error(`${this.c.red}❌ ${text}${this.c.reset}`);
+  }
+
+  /** Outcome: warning */
+  static warn(text: string): void {
+    console.log(`${this.c.yellow}⚠️  ${text}${this.c.reset}`);
+  }
+
+  /** Plain indented line (for code snippets, list items, etc.) */
+  static indent(text: string, level = 1): void {
+    console.log('   '.repeat(level) + text);
+  }
+
+  /** Blank line */
+  static blank(): void {
+    console.log('');
+  }
+}

ts/mod_logger/index.ts

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+export * from './classes.logger.js';