ci(devcontainer): Debian 13 Trixie + Python 3.14, modernize VS Code settings, drop .vscode

.devcontainer/Dockerfile

@@ -1,7 +1,10 @@
-# https://github.com/microsoft/vscode-dev-containers/blob/main/containers/python-3/README.md
-ARG VARIANT=3.13-bookworm
-FROM mcr.microsoft.com/vscode/devcontainers/python:${VARIANT}
+# https://github.com/devcontainers/images/tree/main/src/python
+# Debian 13 "Trixie" base. Python 3.14 is the current latest-stable CPython;
+# the trixie image tags are versioned (there is no floating `3-trixie` alias yet),
+# so we pin the newest available: 3.14-trixie.
+ARG VARIANT=3.14-trixie
+FROM mcr.microsoft.com/devcontainers/python:${VARIANT}
 COPY requirements.txt /tmp/pip-tmp/
 RUN python3 -m pip install --upgrade pip \
   && python3 -m pip install --no-cache-dir -r /tmp/pip-tmp/requirements.txt \
-  && pipx install pre-commit ruff
+  && pipx install pre-commit ruff uv

.devcontainer/devcontainer.json

@@ -4,10 +4,11 @@
 		"dockerfile": "Dockerfile",
 		"context": "..",
 		"args": {
-			// Update 'VARIANT' to pick a Python version: 3, 3.11, 3.10, 3.9, 3.8
-			// Append -bullseye or -buster to pin to an OS version.
-			// Use -bullseye variants on local on arm64/Apple Silicon.
-			"VARIANT": "3.13-bookworm"
+			// This repo tracks the latest-and-greatest CPython. The Debian 13
+			// "Trixie" images are published per minor version (3.11-trixie ...
+			// 3.14-trixie); there is no floating `3-trixie` tag, so bump this
+			// to the newest available when a new stable CPython ships.
+			"VARIANT": "3.14-trixie"
 		}
 	},
 
@@ -20,26 +21,29 @@
 			// Set *default* container specific settings.json values on container create.
 			"settings": {
 				"python.defaultInterpreterPath": "/usr/local/bin/python",
-				"python.linting.enabled": true,
-				"python.formatting.blackPath": "/usr/local/py-utils/bin/black",
-				"python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
+				"editor.formatOnSave": true,
+				"[python]": {
+					"editor.defaultFormatter": "charliermarsh.ruff",
+					"editor.codeActionsOnSave": {
+						"source.fixAll": "explicit",
+						"source.organizeImports": "explicit"
+					}
+				},
 				"terminal.integrated.defaultProfile.linux": "zsh"
 			},
 
 			// Add the IDs of extensions you want installed when the container is created.
 			"extensions": [
 				"ms-python.python",
-				"ms-python.vscode-pylance"
+				"ms-python.vscode-pylance",
+				"charliermarsh.ruff"
 			]
 		}
 	},
 
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
 
-	// Use 'postCreateCommand' to run commands after the container is created.
-	// "postCreateCommand": "pip3 install --user -r requirements.txt",
-
 	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
 	"remoteUser": "vscode"
 }