ci: Add GitHub Actions test workflow + improve test coverage

- Add .github/workflows/test.yml for CI testing
- Tests run on Ubuntu, Windows, macOS across Python 3.9-3.13
- Expand test suite from 16 to 83 tests (91% coverage)
- Add mocked Ollama tests for CLI commands
- Add temp file tests for file operations
- Add badges to README (tests, python version, license)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: michshat

.github/workflows/test.yml

@@ -0,0 +1,40 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[dev]"
+
+      - name: Run tests with coverage
+        run: |
+          pytest tests/ -v --cov=logparseiqx --cov-report=xml --cov-report=term-missing
+
+      - name: Upload coverage to Codecov
+        if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.12'
+        uses: codecov/codecov-action@v4
+        with:
+          file: ./coverage.xml
+          fail_ci_if_error: false

README.md

@@ -1,5 +1,9 @@
 # LogParseIQX
 
+[![Tests](https://github.com/semanticintent/logparseiqx/actions/workflows/test.yml/badge.svg)](https://github.com/semanticintent/logparseiqx/actions/workflows/test.yml)
+[![Python 3.9+](https://img.shields.io/badge/python-3.9+-blue.svg)](https://www.python.org/downloads/)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
 > **"Like cloud AI log parsing but $0"**
 >
 > *grep with intelligence*