feat: add developer experience configuration files

- Add .pre-commit-config.yaml with ruff, mypy, and general checks
- Add .editorconfig for consistent formatting across editors
- Add .vscode/extensions.json with recommended extensions
- Update .gitignore to track .vscode/extensions.json

Improves contributor onboarding and code quality consistency.

Contributors can now:
- Install pre-commit hooks: `pip install pre-commit && pre-commit install`
- Get automatic formatting and linting on commit
- Receive VSCode extension recommendations on repo open

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

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

Author: jwesleye

.editorconfig

@@ -0,0 +1,48 @@
+# EditorConfig helps maintain consistent coding styles across different editors and IDEs
+# https://editorconfig.org/
+
+root = true
+
+# Default settings for all files
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+# Python files
+[*.py]
+indent_size = 4
+max_line_length = 88
+
+# YAML files
+[*.{yml,yaml}]
+indent_size = 2
+
+# TOML files
+[*.toml]
+indent_size = 2
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+max_line_length = off
+
+# JSON files
+[*.json]
+indent_size = 2
+
+# Shell scripts
+[*.sh]
+indent_size = 2
+end_of_line = lf
+
+# Makefiles require tabs
+[Makefile]
+indent_style = tab
+
+# GitHub Actions
+[.github/workflows/*.yml]
+indent_size = 2

.gitignore

@@ -123,7 +123,8 @@ dmypy.json
 .pyre/
 
 # IDEs
-.vscode/
+.vscode/*
+!.vscode/extensions.json
 .idea/
 *.swp
 *.swo

.pre-commit-config.yaml

@@ -0,0 +1,50 @@
+# Pre-commit hooks for code quality and consistency
+# Install: pip install pre-commit && pre-commit install
+# Run manually: pre-commit run --all-files
+# https://pre-commit.com/
+
+repos:
+  # Ruff - Fast Python linter and formatter
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.8.4
+    hooks:
+      # Run the linter
+      - id: ruff
+        args: [--fix]
+      # Run the formatter
+      - id: ruff-format
+
+  # General file checks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-toml
+      - id: check-added-large-files
+        args: ['--maxkb=1000']
+      - id: check-merge-conflict
+      - id: check-case-conflict
+      - id: mixed-line-ending
+        args: ['--fix=lf']
+      - id: detect-private-key
+
+  # Python-specific checks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: check-ast
+      - id: check-builtin-literals
+      - id: check-docstring-first
+      - id: debug-statements
+      - id: name-tests-test
+        args: ['--pytest-test-first']
+
+  # Type checking with mypy
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.13.0
+    hooks:
+      - id: mypy
+        additional_dependencies: [types-PyYAML]
+        args: [--ignore-missing-imports, --no-strict-optional]

.vscode/extensions.json

@@ -0,0 +1,30 @@
+{
+  "recommendations": [
+    // Python language support
+    "ms-python.python",
+
+    // Ruff linter and formatter
+    "charliermarsh.ruff",
+
+    // Test runner integration
+    "ms-python.vscode-pylance",
+
+    // EditorConfig support
+    "editorconfig.editorconfig",
+
+    // GitHub integration
+    "github.vscode-pull-request-github",
+
+    // YAML support
+    "redhat.vscode-yaml",
+
+    // TOML support
+    "tamasfe.even-better-toml",
+
+    // Markdown preview
+    "yzhang.markdown-all-in-one",
+
+    // Git integration
+    "eamodio.gitlens"
+  ]
+}