feat(telegram): opt-in Online/Offline bot status indicator

[teknium1]

Summary

Adds an opt-in Online/Offline status indicator for the Telegram gateway. When enabled, Hermes sets the bot's short description (the line under its name in the profile) to "Online" on gateway connect and "Offline" on clean disconnect — so users can tell whether the gateway is up.

Requested by @ilTrumpista (cc @Teknium).

Why the short description, not presence: Telegram bots have no online/offline dot — that green dot is a user-account feature the Bot API does not expose for bots. The short description is the closest available surface.

Changes

• gateway/platforms/telegram.py: new extra.status_indicator flag (off by default), with optional status_online / status_offline text overrides, read in __init__ from config.extra (no config-schema change). New _set_status_indicator() helper — best-effort, swallows Bot API errors so it never blocks connect/disconnect, truncates to Telegram's 120-char cap. Wired "Online" right after _mark_connected(), "Offline" at the top of disconnect() while the bot HTTP client is still alive.
• tests/gateway/test_telegram_status_indicator.py: 9 unit tests (default-off, enable, online/offline text, custom strings, truncation, bot=None guard, API-failure swallowed).
• website/docs/user-guide/messaging/telegram.md: documents the opt-in and its limitations.

Config

gateway:
  platforms:
    telegram:
      extra:
        status_indicator: true
        # optional overrides:
        status_online: "🟢 Online"
        status_offline: "🔴 Offline"

Limitations (documented)

• Short description is global to the bot (visible to all users), not a per-chat live badge.
• Only a clean shutdown writes "Offline"; a hard crash leaves the last-known status — inherent to a profile-text indicator.

Validation

	Result
tests/gateway/test_telegram_status_indicator.py	9/9 pass
py_compile telegram.py	OK
Stale-base gate	0 behind origin/main, diff = 3 files only

Infographic

[github-actions]

🔎 Lint report: hermes/hermes-f214101a vs origin/main

ruff

Total: 0 on HEAD, 0 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 0 pre-existing issues carried over.

ty (type checker)

Total: 11160 on HEAD, 11159 on base (🆕 +1)

🆕 New issues (1):

Rule	Count
unresolved-import	1

First entries

tests/gateway/test_telegram_status_indicator.py:13: [unresolved-import] unresolved-import: Cannot resolve imported module `pytest`

✅ Fixed issues: none

Unchanged: 5848 pre-existing issues carried over.

Diagnostics are surfaced as warnings — this check never fails the build.