Fix EnvVar template parsing on Python 3.14

[rsgalloway]

This pull request updates the project to support Python 3.14 and improves compatibility and test reliability across Python versions. It adds Python 3.14 to the test matrix and metadata, addresses compatibility issues with Python 3.14 and 3.8, and makes test discovery more robust. The following are the most important changes:

Bumps version to 1.0.3.

Python 3.14 Support and Compatibility:

• Added Python 3.14 to the GitHub Actions test matrix in .github/workflows/tests.yml and updated the CHANGELOG.md to reflect this addition. [1] [2]
• Updated pyproject.toml to include Python 3.14 in the classifiers and to set the package version to 1.0.3 in both pyproject.toml and lib/envstack/__init__.py. [1] [2] [3]
• Restored Python 3.14 compatibility in EnvVar.vars() by avoiding direct access to string.Template internals that now raise errors under Python 3.14.

Python 3.8 Compatibility and Dependency Management:

• Constrained the cryptography dependency to <47 for Python 3.8 in pyproject.toml to avoid incompatibilities, while allowing newer versions for Python 3.9+.
• Suppressed the cryptography Python 3.8 deprecation warning during import in lib/envstack/encrypt.py to keep the CLI and tests quiet on supported 3.8 installs. [1] [2]

Test Suite Improvements:

• Limited pytest test discovery to the tests/ directory and excluded the tmp/ directory to prevent accidental test collection from helper files, as configured in pytest.ini.

[Copilot]

Pull request overview

This pull request updates envstack to support Python 3.14 and improves cross-version compatibility (notably Python 3.8) by adjusting template parsing behavior, dependency markers, and test discovery/configuration.

Changes:

• Add Python 3.14 to CI and published metadata (classifiers), and bump version to 1.0.3.
• Fix EnvVar.vars() to avoid string.Template access patterns that error on Python 3.14.
• Improve test reliability by constraining pytest discovery to tests/ and excluding tmp/, and silence a Python 3.8 cryptography deprecation warning during import.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pytest.ini	Restricts pytest discovery to tests/ and avoids collecting from tmp/.
pyproject.toml	Bumps version, adds Python 3.14 classifier, and constrains cryptography on Python 3.8.
lib/envstack/env.py	Adjusts variable extraction to avoid Python 3.14 template parsing issues.
lib/envstack/encrypt.py	Suppresses Python 3.8 cryptography import warning for cleaner CLI/tests.
lib/envstack/init.py	Bumps library version constant to 1.0.3.
CHANGELOG.md	Documents changes/fixes for release 1.0.3.
.gitignore	Ignores additional local agent/tool directories/files.
.github/workflows/tests.yml	Extends CI matrix to include Python 3.14.

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