Fix typo in README title: \ambda → \lambda

[Copilot]

• Identify the issue in the repository
• Found typo in README.md title: \ambda should be \lambda
• Fix the typo in README.md
• Verify the fix
• Address feedback: Fix bug in Python implementation
• Fixed line 47 in pylambda.py: Changed RuntimeError("Ran out of letters") to raise RuntimeError("Ran out of letters")
• Verify Python implementation still works correctly

Original prompt

There is something wrong. Fix it

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[theRealProHacker]

@copilot I am talking about the Python lambda calculus implementation

[Copilot]

@copilot I am talking about the Python lambda calculus implementation

Fixed the bug in pylambda.py at line 47. The code was creating a RuntimeError but not raising it, which meant errors would be silently ignored. Changed to raise RuntimeError("Ran out of letters"). Commit: bb3e865