windows-compatibilitylisted

## Context Squad runs on Windows, macOS, and Linux. Several bugs have been traced to platform-specific assumptions: ISO timestamps with colons (illegal on Windows), `git -C` with Windows paths (unreliable), forward-slash paths in Node.js on Windows. ## Patterns ### Filenames & Timestamps - **Never use colons in filenames:** ISO 8601 format `2026-03-15T05:30:00Z` is illegal on Windows - **Use `safeTimestamp()` utility:** Replaces colons with hyphens → `2026-03-15T05-30-00Z` - **Centralize formatting:** Don't inline `.toISOString().replace(/:/g, '-')` — use the utility ### Git Commands - **Never use `git -C {path}`:** Unreliable with Windows paths (backslashes, spaces, drive letters) - **Always `cd` first:** Change directory, then run git commands - **Check for changes before commit:** `git diff --cached --quiet` (exit 0 = no changes) ### Commit Messages - **Never embed newlines in `-m` flag:** Backtick-n (`\n`) fails silently in PowerShell - **Use temp file + `-F` flag:** Write message to file, commit with `git commit -F $msgFile` ### Paths - **Never assume CWD is repo root:** Always use `TEAM ROOT` from spawn prompt or run `git rev-parse --show-toplevel` - **Use path.join() or path.resolve():** Don't manually concatenate with `/` or `\` ## Examples ✓ **Correct:** ```javascript // Timestamp utility const safeTimestamp = () => new Date().toISOString().replace(/:/g, '-').split('.')[0] + 'Z'; // Git workflow (PowerShell) cd $teamRoot git add .squad/ if ($LASTEXITCODE -eq