feat: bootstrap scripts auto-launch the installer

get-cameleer.sh and get-cameleer.ps1 now download the installer files
and exec install.sh / install.ps1 immediately instead of just printing
a "run this next" hint. Extra arguments are forwarded to the installer.

PowerShell bootstrap fetches install.ps1 (not install.sh) so Windows
users no longer need bash. README updated to use the bash -c "$(curl ...)"
form so install.sh's interactive prompts inherit the user's TTY.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

get-cameleer.sh

@@ -3,18 +3,20 @@ set -euo pipefail
 
 # Bootstrap script — downloads the Cameleer installer and runs it.
 # Usage:
-#   curl -fsSL https://get.cameleer.io/install | bash
-#   curl -fsSL https://get.cameleer.io/install | bash -s -- --version v1.2.0
+#   bash -c "$(curl -fsSL https://get.cameleer.io/install)"
+#   bash -c "$(curl -fsSL https://get.cameleer.io/install)" -- --version v1.2.0
 
 REPO="https://registry.cameleer.io/cameleer/cameleer-saas-installer/raw"
 REF="branch/main"
 DIR="./installer"
 
-# Parse --version / --ref
+# Parse --version / --ref (consume them; remaining args are forwarded to install.sh)
+PASS_ARGS=()
 for arg in "$@"; do
   case "$arg" in
-    --version=*) REF="tag/${arg#*=}"; shift ;;
-    --ref=*)     REF="branch/${arg#*=}"; shift ;;
+    --version=*) REF="tag/${arg#*=}" ;;
+    --ref=*)     REF="branch/${arg#*=}" ;;
+    *)           PASS_ARGS+=("$arg") ;;
   esac
 done
 
@@ -43,13 +45,8 @@ done
 chmod +x "$DIR/install.sh"
 
 echo ""
-echo "Installer ready in $DIR/"
-echo "Run:  cd $DIR && ./install.sh"
+echo "Installer downloaded to $DIR/ — launching..."
 echo ""
 
-# Auto-run if not piped with extra args that look like they want manual control
-if [ "${1:-}" = "--run" ]; then
-  shift
-  cd "$DIR"
-  exec ./install.sh "$@"
-fi
+cd "$DIR"
+exec ./install.sh "${PASS_ARGS[@]}"