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/bridge/rcDebugLog.ts

@@ -20,7 +20,10 @@ export function rcLog(msg: string): void {
   try {
     if (!headerWritten) {
       ensureLogDir()
-      appendFileSync(LOG_PATH, `\n===== RC-DEBUG session ${new Date().toISOString()} =====\n`)
+      appendFileSync(
+        LOG_PATH,
+        `\n===== RC-DEBUG session ${new Date().toISOString()} =====\n`,
+      )
       headerWritten = true
     }
     const ts = new Date().toISOString().slice(11, 23) // HH:mm:ss.SSS