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).
send_slash_confirm() sent the raw command preview with ParseMode.MARKDOWN,
skipping the format_message() conversion applied to every other dynamic
send in the adapter. Commands with underscores, dots, brackets, or other
MarkdownV2-sensitive characters raised BadRequest: Can't parse entities;
the exception was swallowed by the outer try/except, so the confirmation
prompt silently never appeared.
Fix: wrap preview through format_message() and switch to MARKDOWN_V2,
symmetric with send_update_prompt and the callback sends fixed in
a69404052.
