refactor: reorganize into monorepo with separate subprojects

Structure webber into three independent subprojects:
- webber-api/: FastAPI backend server with all agent code
- webber-cli/: Standalone CLI client (renamed from cli/ to webber_cli/)
- webber-sandbox/: Test project for functional testing

Key changes:
- Each subproject has its own .venv (Python 3.12+)
- Added sandbox.sh for managing test project templates
- Created sandbox-templates/ with calculator-cli and empty starter
- Updated CI/CD for prefixed tags (api/v*, cli/v*)
- Added comprehensive AGENTS.md with operational instructions
- Added gitignore filtering to glob and grep tools
- Created pyproject.toml for each subproject

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

sandbox.sh

@@ -0,0 +1,193 @@
+#!/bin/bash
+# Sandbox management script for Webber testing
+#
+# Usage:
+#   ./sandbox.sh list              - List available templates
+#   ./sandbox.sh load <template>   - Load a template into sandbox
+#   ./sandbox.sh reset             - Reset sandbox to last loaded template
+#   ./sandbox.sh save <name>       - Save current sandbox as new template
+#   ./sandbox.sh status            - Show current sandbox status
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SANDBOX_DIR="$SCRIPT_DIR/webber-sandbox"
+TEMPLATES_DIR="$SCRIPT_DIR/sandbox-templates"
+MARKER_FILE="$SANDBOX_DIR/.current_template"
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+usage() {
+    echo "Webber Sandbox Manager"
+    echo ""
+    echo "Usage: ./sandbox.sh <command> [template]"
+    echo ""
+    echo "Commands:"
+    echo "  list              List available templates"
+    echo "  load <template>   Load a template into sandbox (preserves .venv)"
+    echo "  reset             Reset sandbox to last loaded template"
+    echo "  save <name>       Save current sandbox as new template"
+    echo "  status            Show current sandbox status"
+    echo ""
+    echo "Available templates:"
+    ls -1 "$TEMPLATES_DIR" 2>/dev/null || echo "  (none)"
+}
+
+list_templates() {
+    echo "Available templates:"
+    echo ""
+    for dir in "$TEMPLATES_DIR"/*/; do
+        if [ -d "$dir" ]; then
+            name=$(basename "$dir")
+            desc=""
+            if [ -f "$dir/TASKS.md" ]; then
+                desc=$(head -1 "$dir/TASKS.md" | sed 's/^#\s*//')
+            fi
+            printf "  %-20s %s\n" "$name" "$desc"
+        fi
+    done
+}
+
+load_template() {
+    local template="$1"
+
+    if [ -z "$template" ]; then
+        echo -e "${RED}Error: Template name required${NC}"
+        echo "Usage: ./sandbox.sh load <template>"
+        exit 1
+    fi
+
+    if [ ! -d "$TEMPLATES_DIR/$template" ]; then
+        echo -e "${RED}Error: Template '$template' not found${NC}"
+        echo "Available templates:"
+        ls -1 "$TEMPLATES_DIR"
+        exit 1
+    fi
+
+    echo -e "${YELLOW}Loading template: $template${NC}"
+
+    # Create sandbox dir if needed
+    mkdir -p "$SANDBOX_DIR"
+
+    # Clear sandbox contents (except .venv and .git)
+    find "$SANDBOX_DIR" -mindepth 1 -maxdepth 1 ! -name '.venv' ! -name '.git' -exec rm -rf {} +
+
+    # Copy template contents (including hidden files)
+    cp -r "$TEMPLATES_DIR/$template/." "$SANDBOX_DIR/"
+
+    # Mark which template was loaded
+    echo "$template" > "$MARKER_FILE"
+
+    echo -e "${GREEN}Loaded template: $template${NC}"
+    echo ""
+    echo "Next steps:"
+    echo "  cd webber-sandbox"
+    if [ ! -d "$SANDBOX_DIR/.venv" ]; then
+        echo "  python3.12 -m venv .venv"
+    fi
+    echo "  source .venv/bin/activate"
+    echo "  pip install -r requirements.txt"
+    echo ""
+    if [ -f "$SANDBOX_DIR/TASKS.md" ]; then
+        echo "Tasks available in TASKS.md"
+    fi
+}
+
+reset_template() {
+    if [ ! -f "$MARKER_FILE" ]; then
+        echo -e "${RED}Error: No template loaded yet${NC}"
+        echo "Use './sandbox.sh load <template>' first"
+        exit 1
+    fi
+
+    local template=$(cat "$MARKER_FILE")
+    echo "Resetting to template: $template"
+    load_template "$template"
+}
+
+save_template() {
+    local name="$1"
+
+    if [ -z "$name" ]; then
+        echo -e "${RED}Error: Template name required${NC}"
+        echo "Usage: ./sandbox.sh save <name>"
+        exit 1
+    fi
+
+    if [ -d "$TEMPLATES_DIR/$name" ]; then
+        echo -e "${YELLOW}Warning: Template '$name' already exists${NC}"
+        read -p "Overwrite? [y/N] " -n 1 -r
+        echo
+        if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+            echo "Cancelled"
+            exit 0
+        fi
+        rm -rf "$TEMPLATES_DIR/$name"
+    fi
+
+    mkdir -p "$TEMPLATES_DIR/$name"
+
+    # Copy sandbox contents (except .venv, .git, __pycache__)
+    rsync -a --exclude='.venv' --exclude='.git' --exclude='__pycache__' \
+          --exclude='*.pyc' --exclude='.pytest_cache' --exclude='.mypy_cache' \
+          "$SANDBOX_DIR/" "$TEMPLATES_DIR/$name/"
+
+    echo -e "${GREEN}Saved template: $name${NC}"
+}
+
+show_status() {
+    echo "Sandbox Status"
+    echo "=============="
+    echo ""
+    echo "Sandbox directory: $SANDBOX_DIR"
+
+    if [ -f "$MARKER_FILE" ]; then
+        echo "Current template:  $(cat "$MARKER_FILE")"
+    else
+        echo "Current template:  (none loaded)"
+    fi
+
+    if [ -d "$SANDBOX_DIR/.venv" ]; then
+        echo "Virtual env:       exists"
+    else
+        echo "Virtual env:       not created"
+    fi
+
+    echo ""
+    echo "Contents:"
+    if [ -d "$SANDBOX_DIR" ]; then
+        ls -la "$SANDBOX_DIR" 2>/dev/null | tail -n +4
+    else
+        echo "  (sandbox not initialized)"
+    fi
+}
+
+# Main command dispatch
+case "${1:-}" in
+    list)
+        list_templates
+        ;;
+    load)
+        load_template "$2"
+        ;;
+    reset)
+        reset_template
+        ;;
+    save)
+        save_template "$2"
+        ;;
+    status)
+        show_status
+        ;;
+    -h|--help|"")
+        usage
+        ;;
+    *)
+        echo -e "${RED}Unknown command: $1${NC}"
+        usage
+        exit 1
+        ;;
+esac