helmd v2: Go-server som styr agent i tmux — REST+SSE, frågedetektor, fildelning, ntfy, CI-release

- tmux som sanningskälla (agentoberoende, överlever omstart via adoption)
- API: sessions, prompt, question/answer, keys, mode, config, shares, notify, events
- frågedetektor testad mot riktiga agy 1.1.9-dumpar + mock
- integrationstest: 26 tester i isolerad debian-container (scripts/run-integration.sh)
- e2e-verifierad mot riktig agy (trust-fråga -> svar -> prompt)
- .gitea/workflows/helmd-release.yaml -> rullande helmd-latest (x64+arm64)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

helmd/config.go

@@ -0,0 +1,135 @@
+package main
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type NtfyConfig struct {
+	Server           string   `json:"server"`
+	Topic            string   `json:"topic"`             // server events (questions etc.)
+	AllowedTopics    []string `json:"allowed_topics"`    // POST /api/notify may only use these
+	Enabled          bool     `json:"enabled"`
+	NotifyOnQuestion bool     `json:"notify_on_question"`
+}
+
+type Config struct {
+	Listen    string     `json:"listen"`
+	Token     string     `json:"token"`
+	AgentCmd  string     `json:"agent_cmd"`
+	AgentArgs []string   `json:"agent_args"`
+	Workdir   string     `json:"workdir"`
+	ShareDir  string     `json:"share_dir"`
+	ShareExts []string   `json:"share_exts"`
+	PollMs    int        `json:"poll_ms"`
+	Cols      int        `json:"cols"`
+	Rows      int        `json:"rows"`
+	Ntfy      NtfyConfig `json:"ntfy"`
+
+	path string
+}
+
+func defaultConfig() *Config {
+	home, _ := os.UserHomeDir()
+	return &Config{
+		Listen:    "127.0.0.1:8788",
+		AgentCmd:  "agy",
+		AgentArgs: []string{},
+		Workdir:   home,
+		ShareDir:  filepath.Join(home, ".local/share/helmd/shares"),
+		ShareExts: []string{".html", ".htm", ".md", ".txt", ".json", ".png", ".jpg", ".jpeg", ".gif", ".svg", ".pdf"},
+		PollMs:    500,
+		Cols:      200,
+		Rows:      50,
+		Ntfy: NtfyConfig{
+			Server:           "https://ntfy.brasse-pc.eu",
+			Topic:            "agent-helm",
+			AllowedTopics:    []string{"agent-helm", "claude"},
+			Enabled:          true,
+			NotifyOnQuestion: true,
+		},
+	}
+}
+
+func configPath() string {
+	if p := os.Getenv("HELMD_CONFIG"); p != "" {
+		return p
+	}
+	dir, err := os.UserConfigDir()
+	if err != nil {
+		dir = "."
+	}
+	return filepath.Join(dir, "helmd", "config.json")
+}
+
+// loadConfig reads the config file, creating it with defaults (and a
+// fresh token) on first run.
+func loadConfig(path string) (*Config, error) {
+	cfg := defaultConfig()
+	cfg.path = path
+	data, err := os.ReadFile(path)
+	if os.IsNotExist(err) {
+		cfg.Token = newToken()
+		if err := cfg.Save(); err != nil {
+			return nil, err
+		}
+		fmt.Fprintf(os.Stderr, "helmd: skapade %s (ny token genererad)\n", path)
+		return cfg, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	if err := json.Unmarshal(data, cfg); err != nil {
+		return nil, fmt.Errorf("%s: %w", path, err)
+	}
+	if cfg.Token == "" {
+		cfg.Token = newToken()
+		if err := cfg.Save(); err != nil {
+			return nil, err
+		}
+	}
+	return cfg, nil
+}
+
+func (c *Config) Save() error {
+	if err := os.MkdirAll(filepath.Dir(c.path), 0o755); err != nil {
+		return err
+	}
+	data, err := json.MarshalIndent(c, "", "  ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(c.path, append(data, '\n'), 0o600)
+}
+
+func newToken() string {
+	b := make([]byte, 24)
+	if _, err := rand.Read(b); err != nil {
+		panic(err)
+	}
+	return hex.EncodeToString(b)
+}
+
+func (c *Config) extAllowed(name string) bool {
+	ext := strings.ToLower(filepath.Ext(name))
+	for _, e := range c.ShareExts {
+		if ext == e {
+			return true
+		}
+	}
+	return false
+}
+
+func (c *Config) topicAllowed(topic string) bool {
+	for _, t := range c.Ntfy.AllowedTopics {
+		if topic == t {
+			return true
+		}
+	}
+	return false
+}