fix(bridges): headless tg_send wiring, PermissionRequest handling, /h…

[chauncygu]

…elp output forwarding

Issue #84 follow-up. Two user-visible bugs in headless/Docker deploys:

1. Telegram inline-keyboard approval prompts never appeared:

   • _start_headless_bridges never wired session_ctx.tg_send, so ask_input_interactive's tg_send is not None check failed and prompts fell through to invisible terminal input().
   • _headless_run_query never promoted telegram_incoming → in_telegram_turn, so _is_in_tg_turn() returned False mid-run.
   • _headless_run_query ignored PermissionRequest events entirely, leaving event.granted=False so every approval-required tool was silently denied.

2. /help, /status, /model etc. only sent "✅ /cmd executed." — the actual menu (rendered via print()) went to docker logs instead of the chat. All three bridges (Telegram, Slack, WeChat) had the same shape. Fixed with a stdout/stderr Tee + ANSI strip; the Tee keeps writing to the original stream so docker logs are unaffected.

Also fixed two callback edge cases in bridges/telegram.py:

• Stale clicks on already-answered/timed-out prompts no longer paint a misleading "✓ Selected: y" confirmation onto the message.
• Option values containing backticks/asterisks no longer break Markdown parsing in editMessageText (was failing silently).

Tests: +9 regression tests pinning each fix. 118 bridge tests pass.