Initial commit: linux-provision repo

Distribution-agnostic provisioning script that sets up a new Linux machine
(Detected via lib/distro.sh - supports Debian/Ubuntu/Pop and Fedora families).

13 stages covering:
- System packages, external repos, toolchains (nvm, uv, Python)
- Shell config (zsh, oh-my-zsh, p10k), git, SSH
- Custom uv tools from ~40 git repos
- Desktop config (keybindings, hotkeys, ghostty, fonts)
- Docker, system tweaks, browser/app installs
- Custom systemd user services (porridge, swayidle, mempi-sync, etc.)
- API keys loaded from Bitwarden at shell startup

stages/11-tweaks.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# ===========================================================================
+#  Stage 11: System Tweaks
+#  sysctl tuning, kernel cmdline parameters, TLP/powertop, modprobe.
+#  Uses distro-agnostic variables from lib/distro.sh.
+# ===========================================================================
+#  CAUTION: GPU kernel parameters are hardware-specific (AMD Radeon 680M).
+#  They are COMMENTED OUT by default. Uncomment only if you have the same GPU.
+# ===========================================================================
+
+CONFIG_DIR="${SCRIPT_DIR:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}/config"
+
+# ===========================================================================
+#  1. TLP / PowerTOP
+# ===========================================================================
+info "Configuring power management..."
+
+$SERVICE_ENABLE tlp 2>/dev/null && ok "TLP enabled." || warn "TLP not available."
+
+if command -v powertop &>/dev/null; then
+  # Enable powertop auto-tune via systemd service
+  if [ ! -f /etc/systemd/system/powertop.service ]; then
+    sudo tee /etc/systemd/system/powertop.service > /dev/null << 'EOF'
+[Unit]
+Description=PowerTOP auto tune
+[Service]
+Type=oneshot
+ExecStart=/usr/sbin/powertop --auto-tune
+[Install]
+WantedBy=multi-user.target
+EOF
+    sudo systemctl daemon-reload
+  fi
+  $SERVICE_ENABLE powertop 2>/dev/null && ok "PowerTOP auto-tune enabled." || true
+fi
+
+ok "Stage 11 complete: system tweaks applied."