Salvage of PR #41284 onto current main. Relocates the last 9 inline messaging
adapters (+ satellites: telegram_network, feishu_comment/_rules/meeting_invite,
wecom_crypto, wecom_callback) from gateway/platforms/ into self-contained
bundled plugins under plugins/platforms/<x>/, discovered via the platform
registry. Strips the per-platform core touchpoints from gateway/run.py,
gateway/config.py, hermes_cli/gateway.py, hermes_cli/setup.py, and
tools/send_message_tool.py.
Carries forward the migration fixes (explicit enabled:false honored,
get_connected_platforms forces discovery, plugin is_connected via
gateway.get_env_value, logs --component gateway matches plugins.platforms.*,
matrix hidden on Windows).
Additionally ports config keys main added since the PR base: the matrix
plugin's _apply_yaml_config now also covers allowed_users,
ignore_user_patterns, process_notices, and session_scope (the inline
gateway/config.py matrix block gained these in the 1340 commits the PR sat
open; they would otherwise have been silently dropped on deletion).
Introduce a typed agent→gateway delivery contract so the gateway (not the
agent) decides how each streaming event is rendered per platform. Moves toward
smart-agent/smart-gateway separation while reproducing today's behavior exactly
in the base class.
- gateway/stream_events.py: typed event vocabulary (MessageChunk/Stop,
Commentary, ToolCallChunk/Finished, LongToolHint, GatewayNotice).
- gateway/stream_dispatch.py: GatewayEventDispatcher routes events through the
adapter; adapters can eat events they can't render (e.g. tool chrome on
plain-text platforms).
- gateway/platforms/base.py: render_message_event + format_tool_event default
hooks reproduce the historical emoji/preview tool formatting and consumer
delegation 1:1; adapters override for native rendering.
- gateway/platforms/telegram.py: send_draft now applies MarkdownV2 (format_message
+ parse_mode) with a plain-text fallback on BadRequest, fixing the jarring
raw-text→formatted shift when the draft finalizes as a real sendMessage.
- gateway/config.py: default streaming transport edit → auto. Safe globally:
adapters without draft support report supports_draft_streaming()==False and
transparently use edit, so only Telegram DMs gain native drafts.
Presentation-only contract — nothing rendered here is persisted to conversation
history, preserving cache/message-flow invariants.
