test: add coverage make target

[sundaram2021]

Description

Adds a make test-cov command that runs the full test suite with coverage for the engram package and reports missing lines. Also adds pytest-cov to dev dependencies and updates uv.lock.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)

Related Issues

Fixes #308

Changes Made

• Added test-cov Makefile target with configurable TEST_COV_ARGS
• Added pytest-cov>=7.0.0 to dev dependencies
• Updated uv.lock with pytest-cov and coverage

Testing

Describe the tests you ran to verify your changes:

• Unit tests pass (make test)
• Lint passes (ruff check .)
• Manual testing performed

Additional verification:

• make install
• make test-cov — 622 passed, 2 skipped
• make test-cov TEST_COV_ARGS="tests/test_engine.py --cov=engram --cov-report=term-missing" — 40 passed
• make test-all — 622 passed, 2 skipped

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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