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/__tests__/context.baseline.test.ts

@@ -10,7 +10,11 @@ import {
   setSystemPromptInjection,
 } from '../context'
 import { clearMemoryFileCaches } from '../utils/claudemd'
-import { cleanupTempDir, createTempDir, writeTempFile } from '../../tests/mocks/file-system'
+import {
+  cleanupTempDir,
+  createTempDir,
+  writeTempFile,
+} from '../../tests/mocks/file-system'
 
 let tempDir = ''
 let projectClaudeMdContent = ''