Fix .gitignore/.dockerignore matching cmd/ source dir

Pattern 'woodpecker-mcp' without a slash matched any file or directory
with that name at any depth, silently excluding cmd/woodpecker-mcp/
from commits and Docker build contexts. Anchor to the repo root so
only the compiled root binary is ignored.

.dockerignore

@@ -1,6 +1,6 @@
 # Build artifacts
-woodpecker-mcp
+/woodpecker-mcp
-woodpecker-mcp.exe
+/woodpecker-mcp.exe
 dist/
 *.test
 

.gitignore

@@ -1,6 +1,6 @@
 # Build artifacts
-woodpecker-mcp
+/woodpecker-mcp
-woodpecker-mcp.exe
+/woodpecker-mcp.exe
 dist/
 *.test
 

cmd/woodpecker-mcp/main.go

@@ -0,0 +1,123 @@
+// woodpecker-mcp is a Model Context Protocol (MCP) server that connects AI
+// assistants to Woodpecker CI. It communicates over stdio by default; a
+// remote Streamable HTTP transport is available with --transport=http.
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+	"time"
+
+	mcpgo "github.com/mark3labs/mcp-go/server"
+
+	"gitea.fe.kaien.ru/kaien/woodpecker-mcp/internal/config"
+	"gitea.fe.kaien.ru/kaien/woodpecker-mcp/internal/server"
+	"gitea.fe.kaien.ru/kaien/woodpecker-mcp/internal/woodpecker"
+)
+
+const (
+	transportStdio transport = "stdio"
+	transportHTTP  transport = "http"
+
+	defaultListenAddr = ":8080"
+	shutdownTimeout   = 5 * time.Second
+)
+
+type transport string
+
+func parseTransport(name string) (transport, error) {
+	switch transport(name) {
+	case transportStdio, transportHTTP:
+		return transport(name), nil
+	default:
+		return "", fmt.Errorf("unsupported transport %q (supported: stdio, http)", name)
+	}
+}
+
+func main() {
+	// All logs go to stderr; stdout is reserved for the MCP JSON-RPC protocol
+	// when running over stdio.
+	logger := slog.New(slog.NewTextHandler(os.Stderr, nil))
+
+	var transportName, listenAddr string
+	flag.StringVar(&transportName, "transport", string(transportStdio), "MCP transport: stdio (default) or http")
+	flag.StringVar(&listenAddr, "listen", defaultListenAddr, "HTTP listen address (used with --transport=http)")
+	flag.Parse()
+
+	tr, err := parseTransport(transportName)
+	if err != nil {
+		logger.Error("invalid configuration", "error", err)
+		os.Exit(1)
+	}
+	if tr == transportHTTP && strings.TrimSpace(listenAddr) == "" {
+		logger.Error("invalid configuration", "error", "--listen must not be empty with --transport=http")
+		os.Exit(1)
+	}
+
+	cfg, err := config.Load()
+	if err != nil {
+		logger.Error("invalid configuration", "error", err)
+		os.Exit(1)
+	}
+
+	client, err := woodpecker.NewClient(cfg.APIBaseURL(), cfg.WoodpeckerToken)
+	if err != nil {
+		logger.Error("failed to create Woodpecker API client", "error", err)
+		os.Exit(1)
+	}
+
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	mcpServer := server.New(client)
+
+	switch tr {
+	case transportStdio:
+		runStdio(ctx, logger, mcpServer)
+	case transportHTTP:
+		runHTTP(ctx, logger, mcpServer, listenAddr)
+	}
+}
+
+// runStdio serves the MCP protocol over stdin/stdout until stdin closes or
+// the context is cancelled.
+func runStdio(ctx context.Context, logger *slog.Logger, mcpServer *mcpgo.MCPServer) {
+	transport := mcpgo.NewStdioServer(mcpServer)
+	if err := transport.Listen(ctx, os.Stdin, os.Stdout); err != nil {
+		logger.Error("MCP server stopped with error", "error", err)
+		os.Exit(1)
+	}
+}
+
+// runHTTP serves the MCP protocol over Streamable HTTP at /mcp and shuts
+// down gracefully when the context is cancelled.
+func runHTTP(ctx context.Context, logger *slog.Logger, mcpServer *mcpgo.MCPServer, addr string) {
+	srv := mcpgo.NewStreamableHTTPServer(mcpServer)
+
+	errCh := make(chan error, 1)
+	go func() { errCh <- srv.Start(addr) }()
+	logger.Info("MCP server listening", "address", addr, "endpoint", "/mcp")
+
+	select {
+	case <-ctx.Done():
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownTimeout)
+		defer cancel()
+		if err := srv.Shutdown(shutdownCtx); err != nil {
+			logger.Error("graceful shutdown failed", "error", err)
+			os.Exit(1)
+		}
+	case err := <-errCh:
+		if err != nil && !errors.Is(err, http.ErrServerClosed) {
+			logger.Error("MCP HTTP server failed", "error", err)
+			os.Exit(1)
+		}
+	}
+}