Update t1.txt to match repository naming pattern

[Copilot]

Summary

Updated t1.txt to follow the consistent naming convention used across the repository's text files.

Changes

• Changed the content of t1.txt from "hi there\nhello!" to "t1"

Rationale

The repository follows a simple naming pattern where each text file contains its corresponding identifier:

• t2.txt contains "t2"
• README.md references the sequence: t1, t2, t3, t4

This update makes t1.txt consistent with this established pattern, improving repository organization and clarity.

Testing

• Verified the updated content matches the expected pattern
• Confirmed consistency with other text files in the repository

Original prompt

update t1.txt

Created from VS Code via the [GitHub Pull Request](https://marketplace.visualstudio.com/items?itemName=GitHub.vscode-pull-request-github) extension.

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