feat: unify install.sh — single installer for framework + npm CLI

- tools/install.sh now installs both components:
  1. Framework (bash launcher, guides, runtime configs) → ~/.config/mosaic/
  2. @mosaic/cli (TUI, gateway client, wizard) → ~/.npm-global/
- Downloads framework from monorepo archive (no bootstrap repo dependency)
- Supports --framework, --cli, --check, --ref flags
- Delete remote-install.sh and remote-install.ps1 (redundant redirectors)
- Update all stale mosaic/bootstrap references → mosaic/mosaic-stack
- Update README.md with monorepo install instructions

Deprecates: mosaic/bootstrap repo

packages/mosaic/framework/bin/mosaic.ps1

@@ -49,7 +49,7 @@ Options:
 function Assert-MosaicHome {
     if (-not (Test-Path $MosaicHome)) {
         Write-Host "[mosaic] ERROR: ~/.config/mosaic not found." -ForegroundColor Red
-        Write-Host "[mosaic] Install with: irm https://git.mosaicstack.dev/mosaic/bootstrap/raw/branch/main/remote-install.ps1 | iex"
+        Write-Host "[mosaic] Install with: bash <(curl -fsSL https://git.mosaicstack.dev/mosaic/mosaic-stack/raw/branch/main/tools/install.sh)"
         exit 1
     }
 }