Salvage of PR #27978 cherry-picked onto current main, resolving conflicts
with main's intervening SimpleX plugin fixes (resp-envelope normalization,
health-monitor reconnect-churn fix, bare-form DM addressing).
What's new:
- Group support via SIMPLEX_GROUP_ALLOWED (comma-separated IDs or '*');
inbound items surface chat_id=group:<id> + chat_type=group. Disabled by
default so a bot in a group doesn't process every member's traffic.
- Inbound files/voice via rcvFileDescrReady (immediate /freceive) deferred
through _pending_file_transfers, replayed on rcvFileComplete. Voice notes
-> MessageType.VOICE.
- Native outbound media: send_image (PNG/JPEG + inline thumbnail), send_voice
(msgContent.type=voice), send_video, send_document. All addressed by numeric
ID via /_send ... json [...].
- MEDIA:<path> tags in agent replies stripped and dispatched as voice/document.
- Text-burst batching (HERMES_SIMPLEX_TEXT_BATCH_DELAY, default 0.8s).
- Auto-accept contact requests (SIMPLEX_AUTO_ACCEPT, default true).
- Group send path uses structured /_send #<id> json form (the bracket
#[<id>] form is parsed as display-name lookup and silently drops).
plugin.yaml bumped to 1.1.0; docs updated. All inside plugins/platforms/simplex/
- no core edits.
Co-authored-by: Juraj Bednar <juraj@bednar.io>
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