Various fixes

[m-mohr]

Load the correct class for converters, enable verbose mode via env, move block size check so that it applies for all downloads

[Copilot]

Pull request overview

This PR addresses a few CLI/converter robustness issues: it tightens converter class selection, makes verbose logging configurable via environment, and ensures the “avoid range requests” block-size behavior is applied consistently during downloads.

Changes:

• Restrict converter class discovery to classes defined in the target converter module (avoids picking imported subclasses).
• Add env-controlled verbose mode in LoggerMixin.
• Move block_size=0 injection into download_files() so it applies to all download paths, not just convert().

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
vecorel_cli/converters.py	Narrows class selection to classes defined in the converter module.
vecorel_cli/conversion/base.py	Centralizes avoid_range_request/block_size behavior inside download_files().
vecorel_cli/cli/logger.py	Enables verbose mode via environment variable.
CHANGELOG.md	Adds v0.2.14 release notes and updates compare links.

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