feat: initial Beta 1 release

- soju raw connector with event playback and CHATHISTORY fallback
- SQLite store with msgid de-dup and retention job
- Mentions + Pushover + tuning; structured JSON logs
- Summaries: concise, link-following, multi-line grouping
- HTTP: /healthz, /ready, /tail, /trigger, /metrics
- Docker: distroless, healthcheck, version metadata
- Docs: README, CHANGELOG, compose

internal/notifier/notifier.go

@@ -0,0 +1,8 @@
+package notifier
+
+import "context"
+
+type Notifier interface {
+	Notify(ctx context.Context, title, message string) error
+}
+

internal/notifier/pushover.go

@@ -0,0 +1,39 @@
+package notifier
+
+import (
+    "context"
+    "strings"
+
+    "github.com/gregdel/pushover"
+)
+
+type PushoverNotifier struct {
+    app     *pushover.Pushover
+    userKey string
+}
+
+func NewPushover(userKey, apiToken string) *PushoverNotifier {
+    return &PushoverNotifier{
+        app:     pushover.New(apiToken),
+        userKey: userKey,
+    }
+}
+
+func (p *PushoverNotifier) Notify(ctx context.Context, title, message string) error {
+    if p == nil || p.app == nil || p.userKey == "" {
+        return nil
+    }
+    if len(message) > 1024 {
+        message = message[:1024]
+    }
+    title = strings.TrimSpace(title)
+    msg := &pushover.Message{
+        Title:   title,
+        Message: message,
+    }
+    recipient := pushover.NewRecipient(p.userKey)
+    _, err := p.app.SendMessage(msg, recipient)
+    return err
+}
+
+