chore: initial dotfiles skeleton

.gitignore

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+# macOS
+.DS_Store
+.DS_Store?
+._*
+
+# Backup artifacts
+*.bak
+*.orig
+
+# SSH private keys — never commit unencrypted private keys
+# Remove a line below only if you store GPG-encrypted versions
+.ssh/id_rsa
+.ssh/id_ed25519
+.ssh/id_ecdsa
+.ssh/id_dsa
+.ssh/keys/*_rsa
+.ssh/keys/*_ed25519
+.ssh/keys/*_ecdsa
+.ssh/keys/*.pem
+# Public keys and config are fine
+!.ssh/*.pub
+!.ssh/keys/*.pub
+!.ssh/config
+!.ssh/known_hosts
+
+# GPG-encrypted private key backups are safe to commit
+!.ssh/keys/*.gpg
+
+# Secrets / tokens — never commit
+.env
+.env.*
+*.token
+*.secrets
+vault/
+
+# Machine-local overrides — never commit (written by setup_enterprise_ai_bash.sh)
+.bashrc.local
+.bash_profile.local