chore: full Biome lint cleanup — zero errors, zero warnings

- Remove 203 unused biome-ignore suppression comments (noConsole rule is off)
- Apply all FIXABLE transforms: Math.pow->**, parseInt radix,
  noUselessContinue, noUselessUndefinedInitialization, useIndexOf,
  useRegexLiterals, useShorthandFunctionType, noPrototypeBuiltins
- Add targeted suppressions for 31 intentional patterns
- Format all src/ files via Biome (quote style, import line width)
- Result: 0 errors, 0 warnings across 2649 files

src/cli/handlers/agents.ts

@@ -59,12 +59,9 @@ export async function agentsHandler(): Promise<void> {
   }
 
   if (lines.length === 0) {
-    // biome-ignore lint/suspicious/noConsole:: intentional console output
     console.log('No agents found.')
   } else {
-    // biome-ignore lint/suspicious/noConsole:: intentional console output
     console.log(`${totalActive} active agents\n`)
-    // biome-ignore lint/suspicious/noConsole:: intentional console output
     console.log(lines.join('\n').trimEnd())
   }
 }