feat: scaffold plug-n-play telegram bot on cloudflare workers

grammY-based bot with a module plugin system loaded from the MODULES env
var. Three command visibility levels (public/protected/private) share a
unified command namespace with conflict detection at registry build.

- 4 initial modules (util, wordle, loldle, misc); util fully implemented,
  others are stubs proving the plugin system end-to-end
- util: /info (chat/thread/sender ids) + /help (pure renderer over the
  registry, HTML parse mode, escapes user-influenced strings)
- KVStore interface with CFKVStore and a per-module prefixing factory;
  getJSON/putJSON convenience helpers; other backends drop in via one file
- Webhook at POST /webhook with secret-token validation via grammY's
  webhookCallback; no admin HTTP surface
- Post-deploy register script (npm run deploy = wrangler deploy && node
  --env-file=.env.deploy scripts/register.js) for setWebhook and
  setMyCommands; --dry-run flag for preview
- 56 vitest unit tests across 7 suites covering registry, db wrapper,
  dispatcher, help renderer, validators, and HTML escaper
- biome for lint + format; phased implementation plan under plans/

wrangler.toml

@@ -0,0 +1,22 @@
+name = "miti99bot"
+main = "src/index.js"
+compatibility_date = "2025-10-01"
+
+# Enabled modules at runtime. Comma-separated. Must match static-map keys in src/modules/index.js.
+# Also duplicate this value into .env.deploy so scripts/register.js derives the same public command list.
+[vars]
+MODULES = "util,wordle,loldle,misc"
+
+# KV namespace holding all module state. Each module auto-prefixes its keys via createStore().
+# Create with:
+#   wrangler kv namespace create miti99bot-kv
+#   wrangler kv namespace create miti99bot-kv --preview
+# then paste the returned IDs below.
+[[kv_namespaces]]
+binding = "KV"
+id = "REPLACE_ME"
+preview_id = "REPLACE_ME"
+
+# Secrets (set via `wrangler secret put <name>`, NOT in this file):
+#   TELEGRAM_BOT_TOKEN       — bot token from @BotFather
+#   TELEGRAM_WEBHOOK_SECRET  — arbitrary high-entropy string, also set in .env.deploy