feat: add Python 3.9 support to project

Updates minimum Python requirement from 3.10+ to 3.9+ to support
broader Python version compatibility.

Changes:
- pyproject.toml: Set requires-python = ">=3.9"
- CI workflows: Add Python 3.9 and 3.10 to test matrix
- Black formatter: Add py313 to target versions

The manual test mocking approach implemented in previous commits
already ensures compatibility with Python 3.9's mock behavior.

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

Co-Authored-By: Claude <[email protected]>

Author: Ryan Malloy

.github/workflows/lint.yml

@@ -12,7 +12,7 @@
      name: Lint with Ruff
      strategy:
        matrix:
-         python-version: ["3.11", "3.12", "3.13"]
+         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
      steps:
        - uses: actions/checkout@v4
 
@@ -39,7 +39,7 @@
      name: Pre-commit hooks
      strategy:
        matrix:
-         python-version: ["3.11", "3.12", "3.13"]
+         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
      steps:
        - uses: actions/checkout@v4
 

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest]
 #        os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4

pyproject.toml

@@ -10,7 +10,7 @@ version = "3.0.4"
 description = "A real-time terminal monitoring tool for Claude Code token usage with advanced analytics and Rich UI"
 readme = "README.md"
 license = { text = "MIT" }
-requires-python = ">=3.10"
+requires-python = ">=3.9"
 authors = [{ name = "Maciek", email = "[email protected]" }]
 maintainers = [{ name = "Maciek", email = "[email protected]" }]
 keywords = [
@@ -99,7 +99,7 @@ claude_monitor = ["py.typed"]
 
 [tool.black]
 line-length = 88
-target-version = ["py39", "py310", "py311", "py312"]
+target-version = ["py39", "py310", "py311", "py312", "py313"]
 skip-string-normalization = false
 include = '\.pyi?$'
 extend-exclude = '''