fix: require Python 3.14 and handle bot shutdown race

[ReenigneArcher]

Description

Bump pyproject minimum Python version and classifier to 3.14. In the bot, add an internal _stopping flag and a _run_threaded helper to run the event loop and suppress the "Session is closed" RuntimeError when shutdown is in progress. start_threaded now uses _run_threaded and sets _stopping=False, while shutdown sets _stopping=True before closing to avoid a race when stopping the threaded bot.

Screenshot

Issues Fixed or Closed

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.63%. Comparing base (1b62a04) to head (e84eca2).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/discord_bot/bot.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #534      +/-   ##
==========================================
+ Coverage   61.47%   61.63%   +0.16%     
==========================================
  Files          27       27              
  Lines        1978     1989      +11     
==========================================
+ Hits         1216     1226      +10     
- Misses        762      763       +1     

Files with missing lines	Coverage Δ
src/discord_bot/bot.py	89.21% <90.90%> (+0.20%)	⬆️

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