Fix typo in README: 'program' -> 'programs'

[devin-ai-integration]

Fix typo in README: 'program' → 'programs'

Summary

Fixes a minor grammatical typo in README.md: "All program were written" → "All programs were written". Also trims trailing whitespace on the same line.

Review & Testing Checklist for Human

• Verify the sentence reads correctly: "All programs were written using GnuCOBOL in Linux."

Notes

• Requested by: @chaconne7
• Link to Devin run

[devin-ai-integration]

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