Add essential development configuration files and repository completeness analysis

.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+# BJH OS - Editor Configuration
+# This file helps maintain consistent coding styles across different editors and IDEs
+# Note: The existing codebase primarily uses 4-space indentation, which is reflected here
+
+# Top-most EditorConfig file
+root = true
+
+# Apply to all files
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# HTML Files
+[*.html]
+indent_style = space
+indent_size = 4
+
+# CSS Files
+[*.css]
+indent_style = space
+indent_size = 4
+
+# JavaScript Files
+[*.js]
+indent_style = space
+indent_size = 4
+
+# JSON Files
+[*.json]
+indent_style = space
+indent_size = 2
+
+# YAML Files (for GitHub workflows)
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+# Markdown Files
+[*.md]
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = false
+max_line_length = off
+
+# Text Files
+[*.txt]
+indent_style = space
+indent_size = 4
+insert_final_newline = false
+
+# Makefiles (if added in future)
+[Makefile]
+indent_style = tab

.gitignore

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+# BJH OS - .gitignore
+# Prevents unwanted files from being committed to the repository
+
+# ===========================
+# OS Generated Files
+# ===========================
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ethumbs.db
+Thumbs.db
+Desktop.ini
+$RECYCLE.BIN/
+
+# ===========================
+# Editor & IDE Files
+# ===========================
+# Visual Studio Code
+.vscode/*
+!.vscode/extensions.json
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+
+# JetBrains IDEs (WebStorm, IntelliJ, etc.)
+.idea/
+*.iml
+*.iws
+*.ipr
+
+# Sublime Text
+*.sublime-workspace
+*.sublime-project
+
+# Vim
+*.swp
+*.swo
+*~
+.*.sw[a-p]
+
+# Emacs
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+
+# Notepad++
+*.bak
+
+# ===========================
+# Temporary Files
+# ===========================
+*.tmp
+*.temp
+*.log
+*.cache
+tmp/
+temp/
+
+# ===========================
+# Build Artifacts
+# ===========================
+dist/
+build/
+out/
+*.min.js
+*.min.css
+*.map
+
+# ===========================
+# Dependencies
+# ===========================
+node_modules/
+bower_components/
+jspm_packages/
+vendor/
+
+# ===========================
+# Environment & Config Files
+# ===========================
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+.env.*.local
+
+# ===========================
+# Testing & Coverage
+# ===========================
+coverage/
+*.coveragerc
+.nyc_output/
+.coverage
+htmlcov/
+*.lcov
+
+# ===========================
+# Package Manager Files
+# ===========================
+# Note: package-lock.json is ignored for this project as it's a pure client-side
+# web app with no production dependencies. If dependencies are added in the future,
+# consider removing this line to ensure reproducible builds.
+package-lock.json
+yarn.lock
+pnpm-lock.yaml
+.pnpm-debug.log*
+
+# ===========================
+# Cache Directories
+# ===========================
+.cache/
+.parcel-cache/
+.next/
+.nuxt/
+.vuepress/dist/
+.serverless/
+
+# ===========================
+# PWA & Service Worker Cache
+# ===========================
+# Uncomment if you want to ignore service worker cache
+# sw-cache/
+# workbox-*.js
+
+# ===========================
+# Misc
+# ===========================
+*.pid
+*.seed
+*.pid.lock
+.npm
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*