Rewrite from TypeScript to Go

Complete rewrite of the Freebee Matrix bot as GogoBee using mautrix-go.

- E2EE with goolm (pure Go, no CGo/libolm) and cross-signing bootstrap
- 35+ plugins with dependency injection and ordered registration
- SQLite storage via modernc.org/sqlite (no CGo)
- Scheduler via robfig/cron for WOTD, holidays, birthdays, releases, etc.
- Optional LLM integration (Ollama) for sentiment, profanity, roasts, vibes
- Threaded trivia, three-tier profanity tracking, WOTD usage verification
- Multi-country holiday support with deduplication
- Quadratic XP curve, configurable bot display name, encrypted DMs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/plugin/shade.go

@@ -0,0 +1,48 @@
+package plugin
+
+import (
+	"os"
+
+	"maunium.net/go/mautrix"
+)
+
+// ShadePlugin is a stub plugin for future shade/roast features.
+type ShadePlugin struct {
+	Base
+	enabled bool
+}
+
+// NewShadePlugin creates a new shade plugin.
+func NewShadePlugin(client *mautrix.Client) *ShadePlugin {
+	return &ShadePlugin{
+		Base:    NewBase(client),
+		enabled: os.Getenv("FEATURE_SHADE") == "true" || os.Getenv("FEATURE_SHADE") == "1",
+	}
+}
+
+func (p *ShadePlugin) Name() string { return "shade" }
+
+func (p *ShadePlugin) Commands() []CommandDef {
+	if !p.enabled {
+		return nil
+	}
+	return []CommandDef{
+		{Name: "shade", Description: "Throw some shade (coming soon)", Usage: "!shade", Category: "LLM & Sentiment"},
+	}
+}
+
+func (p *ShadePlugin) Init() error { return nil }
+
+func (p *ShadePlugin) OnReaction(_ ReactionContext) error { return nil }
+
+func (p *ShadePlugin) OnMessage(ctx MessageContext) error {
+	if !p.enabled {
+		return nil
+	}
+
+	if p.IsCommand(ctx.Body, "shade") {
+		return p.SendReply(ctx.RoomID, ctx.EventID, "Coming soon.")
+	}
+
+	return nil
+}