Extend the normalized-envelope pipeline shipped in #82063 with new event
types, each with its own versioned, event-local payload contract:
- Telegram: message_edited (edited_message updates; editor-identity auth
extraction, forum topic thread_id, bounded text/caption, ISO edited_at)
- Discord: message_edited, message_deleted, thread_created, thread_renamed
(on_message_edit/delete, on_thread_create/update fire-sites with has_hook
no-subscriber fast-paths, bot-authored events dropped, rename-only
filtering on thread updates)
All events flow through the same gateway-owned post-auth boundary; malformed
or unauthorized events drop, fail closed. Raw SDK payload access is
deliberately NOT shipped (round-2 correction: needs its own
gateway.raw_events capability and design).
The Discord fire-site machinery (no-subscriber fast-path, observer isolation,
connect-time wiring) adapts the observer-hook design from PR #62584
(@paoloantinori) onto the normalized-envelope contract; PR #36875's raw
telegram update hook is superseded by the same correction.
Docs: hooks.md gains per-event payload contract tables.
Co-authored-by: Paolo Antinori <pantinor@redhat.com>
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