Adopt chezmoi for dotfiles delivery; retain mise for post-apply verification

[Copilot]

The repo lacked a structured, idempotent delivery mechanism across macOS, Linux, and container environments. This adopts chezmoi as the primary dotfiles manager while keeping mise as a post-apply verifier.

Structural change

• Rename .config/ → dot_config/ — aligns with chezmoi's source naming convention so dot_config/nvim/init.vim deploys to ~/.config/nvim/init.vim

New files

• .chezmoi.toml.tmpl — config template; reads GIT_AUTHOR_NAME/GIT_AUTHOR_EMAIL env vars, gracefully falls back to empty strings for CI dry-runs
• run_once_after_verify.sh — chezmoi post-apply hook; runs mise doctor when available, skips silently otherwise
• .github/workflows/dotfiles-ci.yml — smoke-test matrix across ubuntu-latest, macos-latest, debian:latest, alpine:latest; each job runs chezmoi apply --dry-run --no-tty --verbose

Updated files

• script/bootstrap.sh — fixes template path (dot_config/nvim/), skips the dot_config directory in the dot_* glob, and adds a dedicated loop that symlinks each XDG config subdirectory individually (no folder-level symlinks)
• README.md — chezmoi as recommended install path; legacy bootstrap preserved for backward compat; CI badge added

Usage

# Preview what would change (CI-safe, no prompts)
chezmoi init --apply --dry-run DustinVenegas/dotfiles

# Apply for real
chezmoi init --apply DustinVenegas/dotfiles