Events: Add support for additional events in extra Modules

[hikingc]

Some events are still missing, many are from the modules section, this issue was generated to track them.

Missing events

State events (has state_key)

• m.policy.rule.user
• m.policy.rule.room
• m.policy.rule.server
• m.room.image_pack (new in v1.19, MSC2545)
• m.image_pack.rooms (new in v1.19, MSC2545)
• m.room.recommended_packs (MSC2545, widget-facing)
• m.beacon_info (MSC3489, live location)
• m.widget / im.vector.modular.widgets (widget state, unstable-ish but widely deployed)

Timeline / transactional events (no state_key, sent via txnId)

• m.beacon (MSC3489, live location position updates — ephemeral-ish timeline event, pairs with m.beacon_info)
• org.matrix.msc3381.poll.start (MSC3381, unstable-prefixed but widely deployed)
• org.matrix.msc3381.poll.response
• org.matrix.msc3381.poll.end
• m.key.verification.ready (missing from your verification flow: request → ready → start → accept → key → mac → done/cancel)

Account data (global or room-scoped, no state_key, delivered via /sync account_data)

• m.push_rules
• m.ignored_user_list
• m.identity_server
• m.secret_storage.key.*
• m.secret_storage.default_key
• m.cross_signing.master
• m.cross_signing.self_signing
• m.cross_signing.user_signing
• m.megolm_backup.v1
• m.key_backup (new in v1.19, MSC4287)
• m.recent_emoji (MSC4356 — verify exact landing version)

To-device events (not /sync timeline, not account_data — via /sync to_device or PUT /sendToDevice)

• m.room_key
• m.room_key_request
• m.forwarded_room_key
• m.dummy
• m.secret.request
• m.secret.send
• MSC4268 encrypted-history-sharing to-device types (new in v1.19 — check current spec text for exact event type names)

Notes

• m.room.aliases is deprecated — skip, superseded by canonical alias + room directory.
• Message edits (rel_type: m.replace) and thread replies (rel_type: m.thread) are not separate event types — they're m.room.message (etc.) with m.relates_to. No new type needed, just make sure content models handle m.relates_to.
• m.typing/m.receipt/m.presence are /sync ephemeral, while m.tag/m.direct/m.fully_read are /sync account_data — two different sync sections, worth distinct wrapper types if not already separated.