build: tighten runtime deps and lower Python floor to 3.11

- requires-python: >=3.13 -> >=3.11. The code does not use any
  3.13-only feature. typing.List/Dict/Union/Optional throughout, no
  PEP 695 generics, no Self, no match. Classifiers updated to advertise
  3.11/3.12/3.13.
- runtime dependencies: trim to requests only.
  - python-dotenv is only used by examples; move to the dev extra.
  - urllib3 is never imported by pyvyos directly; it remains available
    transitively through requests.
- pre-existing dev tooling (pytest, pytest-cov, pytest-env) untouched.
- CI: PR validation runs on a 3.11/3.12/3.13 matrix.
- README: reword the Python requirement.
- .python-version: 3.13.0 -> 3.13 (CI uses the matrix).
- Wheel build verified to include pyvyos/py.typed and to declare
  Requires-Python: >=3.11 with requests as the only runtime requirement.

5 files changed, 23 insertions, 9 deletions

diff --git a/.github/workflows/python-pr-validation.yml b/.github/workflows/python-pr-validation.yml
index 611372b..081f7a8 100644
--- a/.github/workflows/python-pr-validation.yml
+++ b/.github/workflows/python-pr-validation.yml
@@ -10,14 +10,18 @@ permissions:
 jobs:
   validate:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12", "3.13"]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up Python 3.13
+      - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
+          python-version: ${{ matrix.python-version }}
 
       - name: Install uv
         uses: astral-sh/setup-uv@v3
@@ -25,7 +29,7 @@ jobs:
           enable-cache: true
 
       - name: Install dependencies
-        run: uv sync --extra dev
+        run: uv sync --extra dev --python ${{ matrix.python-version }}
 
       - name: Run tests
-        run: uv run pytest -v
+        run: uv run --python ${{ matrix.python-version }} pytest -v
diff --git a/.python-version b/.python-version
index 4eba2a6..24ee5b1 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.13.0
+3.13
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13bc332..293a942 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,15 @@ behavior**.
 - Documented public API stability and deprecation timeline in `README.md`.
 
 ### Changed
+- `requires-python` lowered to `>=3.11` (was `>=3.13`). The codebase
+  does not use any 3.13-only syntax, and the lower floor makes the
+  package reachable for the typical VyOS automation environment. CI now
+  validates against 3.11, 3.12, and 3.13.
+- Runtime dependencies trimmed to `requests>=2.32.0,<3.0` only.
+  - `python-dotenv` was never imported by the library itself — it is now
+    a `dev` extra used by the bundled examples.
+  - `urllib3` was never used directly by `pyvyos` — it stays available
+    transitively through `requests`.
 - `vagrant/` lab setup moved to `examples/vagrant/`.
 - `pyvyos.core.*` is now the internal implementation layer; the supported
   public API is `from pyvyos import VyDevice, ApiResponse`. The legacy
diff --git a/README.md b/README.md
index 96c1ec8..83dbd90 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ tooling, and integrations with configuration management systems.
 pip install pyvyos
 ```
 
-Requires **Python 3.13 or newer**.
+Requires **Python 3.11 or newer**. Tested on 3.11, 3.12, and 3.13.
 
 ## Quick start
 
diff --git a/pyproject.toml b/pyproject.toml
index 1f35384..b266351 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ authors = [
 ]
 description = "Python SDK for interacting with the VyOS HTTPS API"
 readme = "README.md"
-requires-python = ">=3.13"
+requires-python = ">=3.11"
 license = { file = "LICENSE" }
 keywords = ["vyos", "networking", "sdk", "api", "router", "firewall"]
 classifiers = [
@@ -20,6 +20,8 @@ classifiers = [
     "Topic :: System :: Networking",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
@@ -27,12 +29,11 @@ classifiers = [
 ]
 dependencies = [
     "requests>=2.32.0,<3.0",
-    "python-dotenv>=1.0.1,<2.0",
-    "urllib3>=2.5.0",
 ]
 
 [project.optional-dependencies]
 dev = [
+    "python-dotenv>=1.0.1,<2.0",
     "pytest>=8.0,<10.0",
     "pytest-cov>=5.0,<7.0",
     "pytest-env>=0.6.2,<1.3",