Initialize Hayden project repository

.gitignore

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+# ------------------------------
+# OS
+# ------------------------------
+.DS_Store
+.AppleDouble
+.LSOverride
+Icon?
+._*
+.Spotlight-V100
+.Trashes
+
+# ------------------------------
+# Editor / IDE
+# ------------------------------
+.vscode/
+!.vscode/extensions.json
+!.vscode/settings.json
+.idea/
+*.iml
+*.swp
+*.swo
+*~
+
+# ------------------------------
+# Environment / Secrets
+# ------------------------------
+.env
+.env.*
+!.env.example
+!.env.sample
+*.pem
+*.p12
+*.key
+
+# ------------------------------
+# Logs / Runtime
+# ------------------------------
+*.log
+logs/
+*.pid
+*.pid.lock
+*.seed
+
+# ------------------------------
+# Archives / Temp
+# ------------------------------
+*.tmp
+*.temp
+*.bak
+*.orig
+*.rej
+*.zip
+*.tar
+*.gz
+*.tgz
+*.7z
+
+# ------------------------------
+# Dependency directories
+# ------------------------------
+node_modules/
+vendor/
+
+# ------------------------------
+# Build outputs / caches
+# ------------------------------
+dist/
+build/
+out/
+coverage/
+.cache/
+.tmp/
+tmp/
+
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/
+venv/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+
+# JavaScript / TypeScript
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+.next/
+.nuxt/
+.svelte-kit/
+.parcel-cache/
+*.tsbuildinfo
+
+# Java / Kotlin
+.gradle/
+.classpath
+.project
+.settings/
+*.class
+
+# Rust
+/target/
+
+# Go
+bin/
+*.test
+
+# Terraform
+.terraform/
+*.tfstate
+*.tfstate.*
+.terraform.lock.hcl
+
+# ------------------------------
+# Testing artifacts
+# ------------------------------
+junit.xml
+coverage.xml
+htmlcov/
+
+# ------------------------------
+# Local database / sqlite
+# ------------------------------
+*.sqlite
+*.sqlite3
+*.db