feat: add Explore agent with PydanticAI tool calling

Implements the first Claude-like agent for codebase exploration:

Core Features:
- Explore agent with glob, grep, read, and bash tools
- Native PydanticAI tool calling with Ollama/Mistral Nemo
- Sanitized Ollama provider (fixes content:null issue)
- REST API endpoints for agent execution

Tool Infrastructure:
- BaseTool abstract class with ToolResult dataclass
- ReadFileTool, GlobFilesTool, GrepContentTool, BashReadOnlyTool
- Path validation and sandboxing support

CLI Client (separate package for future extraction):
- webber-cli command with chat, explore, status commands
- Communicates with Webber API backend
- Rich console output with theming

Configuration:
- Dev server on port 8095 (production uses 8086)
- Mistral Nemo optimizations (temp 0.3, tool_choice required)

Tests: 24 tests covering tools and API endpoints

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

wakeup.sh

@@ -11,11 +11,14 @@ NC='\033[0m' # No Color
 
 echo -e "${GREEN}Starting Webber...${NC}"
 
-# Check if port 8086 is already in use
-if lsof -Pi :8086 -sTCP:LISTEN -t >/dev/null 2>&1 ; then
-    echo -e "${RED}Error: Port 8086 is already in use${NC}"
-    echo "Run: lsof -i :8086 to see what's using it"
-    echo "Or run: kill \$(lsof -t -i:8086) to stop it"
+# Development port (8095) - Production uses 8086 in Docker
+DEV_PORT=8095
+
+# Check if dev port is already in use
+if lsof -Pi :$DEV_PORT -sTCP:LISTEN -t >/dev/null 2>&1 ; then
+    echo -e "${RED}Error: Port $DEV_PORT is already in use${NC}"
+    echo "Run: lsof -i :$DEV_PORT to see what's using it"
+    echo "Or run: kill \$(lsof -t -i:$DEV_PORT) to stop it"
     exit 1
 fi
 
@@ -41,8 +44,9 @@ LOG_FILE="$LOGS_DIR/server.log"
 echo -e "${YELLOW}Logs will be written to: ${LOG_FILE}${NC}"
 
 # Start the server
-echo -e "${GREEN}Starting uvicorn server on http://localhost:8086${NC}"
+echo -e "${GREEN}Starting uvicorn server on http://localhost:$DEV_PORT${NC}"
+echo -e "${YELLOW}Production is on :8086, dev is on :$DEV_PORT${NC}"
 echo -e "${YELLOW}Press Ctrl+C to stop the server${NC}"
 echo ""
 
-uvicorn src.main:app --reload --host 0.0.0.0 --port 8086 2>&1 | tee "$LOG_FILE"
+uvicorn src.main:app --reload --host 0.0.0.0 --port $DEV_PORT 2>&1 | tee "$LOG_FILE"