Fix errant maxReadFileLine default

[mrubens]

Important

Change default maxReadFileLine from 500 to -1 in readFileTool() to allow unlimited lines by default.

• Behavior:
  • Change default value of maxReadFileLine from 500 to -1 in readFileTool() in readFileTool.ts.
  • Affects how files are read when maxReadFileLine is not set, potentially allowing unlimited lines to be read by default.

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