new release 2.9.1

[dacracot]

No description provided.

[greptile-apps]

Greptile Summary

This pull request implements the release process for version 2.9.1 of the BirdNET-BarChart project. The changes focus on updating the version tracking and update system components to support the new release.

The primary changes include:

1. Version tracking updates: The release.txt file is updated from version 2.9 to 2.9.1, which serves as the canonical version identifier used by various scripts throughout the system.

2. Release signature update: The signature.txt file is updated with new version metadata (2.9.1) and commit information (commit hash 56e3b1b from Saturday, 23 August 2025 at 06:52). This file is used by the automated update system to track release state and determine when updates are available.

3. Version-specific update script: A new update-2.9.1-tasks.sh script is added that follows the established pattern for update scripts in this project. The script implements proper semaphore locking to prevent duplicate execution and cascades to the previous version's update script (2.8). Like recent versions, this is a maintenance release with no specific migration tasks required.

These changes integrate seamlessly with the existing update infrastructure. The project uses an automated release system (newRelease.sh) that generates these files from templates, and an update mechanism (update.sh) that uses git tags and version-specific task scripts to manage installations. The cascading update system ensures users updating from older versions will have all intermediate scripts executed in proper sequence.

Confidence score: 5/5

• This PR is extremely safe to merge with virtually no risk of production issues
• Score reflects simple version tracking updates following established patterns with no functional code changes
• No files require special attention as these are standard release management files

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