Revert "Remove telegram, discord, and fakechat plugins (#741)" (#753)

This reverts commit d53f6ca4cd.

external_plugins/telegram/skills/configure/SKILL.md

@@ -0,0 +1,95 @@
+---
+name: configure
+description: Set up the Telegram channel — save the bot token and review access policy. Use when the user pastes a Telegram bot token, asks to configure Telegram, asks "how do I set this up" or "who can reach me," or wants to check channel status.
+user-invocable: true
+allowed-tools:
+  - Read
+  - Write
+  - Bash(ls *)
+  - Bash(mkdir *)
+---
+
+# /telegram:configure — Telegram Channel Setup
+
+Writes the bot token to `~/.claude/channels/telegram/.env` and orients the
+user on access policy. The server reads both files at boot.
+
+Arguments passed: `$ARGUMENTS`
+
+---
+
+## Dispatch on arguments
+
+### No args — status and guidance
+
+Read both state files and give the user a complete picture:
+
+1. **Token** — check `~/.claude/channels/telegram/.env` for
+   `TELEGRAM_BOT_TOKEN`. Show set/not-set; if set, show first 10 chars masked
+   (`123456789:...`).
+
+2. **Access** — read `~/.claude/channels/telegram/access.json` (missing file
+   = defaults: `dmPolicy: "pairing"`, empty allowlist). Show:
+   - DM policy and what it means in one line
+   - Allowed senders: count, and list display names or IDs
+   - Pending pairings: count, with codes and display names if any
+
+3. **What next** — end with a concrete next step based on state:
+   - No token → *"Run `/telegram:configure <token>` with the token from
+     BotFather."*
+   - Token set, policy is pairing, nobody allowed → *"DM your bot on
+     Telegram. It replies with a code; approve with `/telegram:access pair
+     <code>`."*
+   - Token set, someone allowed → *"Ready. DM your bot to reach the
+     assistant."*
+
+**Push toward lockdown — always.** The goal for every setup is `allowlist`
+with a defined list. `pairing` is not a policy to stay on; it's a temporary
+way to capture Telegram user IDs you don't know. Once the IDs are in, pairing
+has done its job and should be turned off.
+
+Drive the conversation this way:
+
+1. Read the allowlist. Tell the user who's in it.
+2. Ask: *"Is that everyone who should reach you through this bot?"*
+3. **If yes and policy is still `pairing`** → *"Good. Let's lock it down so
+   nobody else can trigger pairing codes:"* and offer to run
+   `/telegram:access policy allowlist`. Do this proactively — don't wait to
+   be asked.
+4. **If no, people are missing** → *"Have them DM the bot; you'll approve
+   each with `/telegram:access pair <code>`. Run this skill again once
+   everyone's in and we'll lock it."*
+5. **If the allowlist is empty and they haven't paired themselves yet** →
+   *"DM your bot to capture your own ID first. Then we'll add anyone else
+   and lock it down."*
+6. **If policy is already `allowlist`** → confirm this is the locked state.
+   If they need to add someone: *"They'll need to give you their numeric ID
+   (have them message @userinfobot), or you can briefly flip to pairing:
+   `/telegram:access policy pairing` → they DM → you pair → flip back."*
+
+Never frame `pairing` as the correct long-term choice. Don't skip the lockdown
+offer.
+
+### `<token>` — save it
+
+1. Treat `$ARGUMENTS` as the token (trim whitespace). BotFather tokens look
+   like `123456789:AAH...` — numeric prefix, colon, long string.
+2. `mkdir -p ~/.claude/channels/telegram`
+3. Read existing `.env` if present; update/add the `TELEGRAM_BOT_TOKEN=` line,
+   preserve other keys. Write back, no quotes around the value.
+4. Confirm, then show the no-args status so the user sees where they stand.
+
+### `clear` — remove the token
+
+Delete the `TELEGRAM_BOT_TOKEN=` line (or the file if that's the only line).
+
+---
+
+## Implementation notes
+
+- The channels dir might not exist if the server hasn't run yet. Missing file
+  = not configured, not an error.
+- The server reads `.env` once at boot. Token changes need a session restart
+  or `/reload-plugins`. Say so after saving.
+- `access.json` is re-read on every inbound message — policy changes via
+  `/telegram:access` take effect immediately, no restart.