chore(devops): add cross-platform runners and README; normalize EOLs

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.gitattributes

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+# Enforce LF for shell scripts and text files
+*.sh text eol=lf
+*.ps1 text eol=lf
+*.md text eol=lf

README_INSTALL.md

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+Installation guide — learning_ai_devops_tools
+
+Purpose
+
+This repository contains interactive, safe installers and helpers to install CLI tools (Claude Code, OpenAI Codex, Antigravity agy, Devin, GitHub Copilot) on WSL/Ubuntu, macOS, and Windows.
+
+Files of interest
+
+- install_clis_wsl.sh  — interactive WSL installer (WSL/Ubuntu). Preview and confirm before running remote installers.
+- make_symlinks_wsl.sh — creates /usr/local/bin symlinks (requires sudo)
+- run_installers.sh    — cross-platform wrapper to run installers from WSL or show instructions
+- run_installers.ps1   — Windows PowerShell wrapper to run WSL or show Windows-native steps
+- cli-install-report.md — generated report of installs (example)
+
+Quick start (WSL/Ubuntu)
+
+1. Open WSL (Ubuntu) shell.
+2. cd /mnt/d/SANDBOX/mygh/learning_ai_devops_tools
+3. Ensure scripts use LF and are executable:
+   sudo apt-get update && sudo apt-get install -y dos2unix
+   dos2unix install_clis_wsl.sh run_installers.sh make_symlinks_wsl.sh || true
+   chmod +x install_clis_wsl.sh run_installers.sh make_symlinks_wsl.sh
+4. Run the interactive installer (will preview each remote installer and ask confirmation):
+   bash -i ./install_clis_wsl.sh
+
+Quick start (Windows PowerShell with WSL)
+
+- From PowerShell run (recommended):
+  wsl bash -ic "cd /mnt/d/SANDBOX/mygh/learning_ai_devops_tools && dos2unix install_clis_wsl.sh || true && bash -i ./install_clis_wsl.sh"
+
+Quick start (macOS)
+
+- Inspect installers first. macOS support is similar to Linux; use the run_installers.sh wrapper to list commands. Do NOT pipe unknown scripts to shell without review.
+
+Security and safety
+
+- All remote installers are previewed before execution.
+- No secrets or API keys are written to shell profiles.
+- Auth steps are left interactive (use the tool's login commands).
+
+Developer notes
+
+- Use .gitattributes to enforce LF endings on shell scripts across platforms.
+- To reproduce: run the scripts from a fresh WSL Ubuntu session and follow interactive prompts.
+
+If you want, run './run_installers.sh' to get an interactive cross-platform flow.

run_installers.ps1

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+<#
+PowerShell wrapper to launch the WSL installer or show platform-specific instructions.
+Usage: .\run_installers.ps1 [-Preview]
+#>
+param([switch]$Preview)
+
+Write-Host "Running cross-platform installer helper"
+if (Get-Command wsl -ErrorAction SilentlyContinue) {
+  if ($Preview) {
+    wsl bash -lc 'sed -n "1,120p" /mnt/d/SANDBOX/mygh/learning_ai_devops_tools/install_clis_wsl.sh'
+  } else {
+    wsl bash -ic "cd /mnt/d/SANDBOX/mygh/learning_ai_devops_tools && bash -i ./install_clis_wsl.sh"
+  }
+} else {
+  Write-Host "WSL not found. Please run manually on the target platform according to README_INSTALL.md"
+}

run_installers.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# Cross-platform wrapper to run installers or show instructions.
+# Usage: ./run_installers.sh [--preview]
+
+PREVIEW=0
+if [ "${1:-}" = "--preview" ]; then PREVIEW=1; fi
+
+is_wsl() {
+  grep -qi microsoft /proc/version 2>/dev/null || grep -qi microsoft /proc/sys/kernel/osrelease 2>/dev/null
+}
+
+echo "Cross-platform installer helper"
+if is_wsl; then
+  echo "Detected WSL/Ubuntu environment."
+  if [ "$PREVIEW" -eq 1 ]; then
+    echo "Preview mode: showing installers to be executed by install_clis_wsl.sh"
+    sed -n '1,120p' install_clis_wsl.sh
+    exit 0
+  fi
+  read -rp "Run the interactive WSL installer (install_clis_wsl.sh)? [y/N]: " ans
+  case "$ans" in
+    [Yy]*) bash -i ./install_clis_wsl.sh ;;
+    *) echo "Cancelled by user."; exit 0 ;;
+  esac
+else
+  echo "Not in WSL. Recommended flows:"
+  echo "- Run this from Windows PowerShell using WSL: wsl bash -ic 'cd /mnt/d/SANDBOX/mygh/learning_ai_devops_tools && bash -i ./install_clis_wsl.sh'"
+  echo "- On macOS or Linux, inspect install_clis_wsl.sh and run it in a bash login shell after review."
+  exit 0
+fi