xmtp_proto: bump to xmtp/proto XIP-82 revisions (typed invite primitives) + adapt invite::payload

crates/xmtp_mls/src/groups/app_data/bootstrap_validator.rs

@@ -840,6 +840,7 @@ mod tests {
             version: Some(GroupMembershipEntryVersion::V1(GroupMembershipEntryV1 {
                 sequence_id: seq,
                 failed_installations: failed,
+                admitted_via_external_group_id: vec![],
             })),
         }
     }

crates/xmtp_mls/src/groups/app_data/component_source.rs

@@ -2375,6 +2375,7 @@ mod tests {
                 version: Some(Version::V1(GroupMembershipEntryV1 {
                     sequence_id: 1,
                     failed_installations: vec![],
+                    admitted_via_external_group_id: vec![],
                 })),
             },
         );
@@ -2399,6 +2400,7 @@ mod tests {
                 version: Some(Version::V1(GroupMembershipEntryV1 {
                     sequence_id: 7,
                     failed_installations: vec![vec![0xA1; 16]],
+                    admitted_via_external_group_id: vec![],
                 })),
             },
         );
@@ -2408,6 +2410,7 @@ mod tests {
                 version: Some(Version::V1(GroupMembershipEntryV1 {
                     sequence_id: 42,
                     failed_installations: vec![vec![0xB1; 16]],
+                    admitted_via_external_group_id: vec![],
                 })),
             },
         );

crates/xmtp_mls/src/groups/app_data/migration.rs

@@ -285,6 +285,10 @@ async fn build_partitioned_group_membership<C: XmtpSharedContext>(
                 version: Some(GroupMembershipEntryVersion::V1(GroupMembershipEntryV1 {
                     sequence_id: *seq,
                     failed_installations: failed,
+                    // Every pre-migration member was added via Welcome /
+                    // legacy flows, never an external commit, so the
+                    // admitted-via tag is correctly absent for all of them.
+                    admitted_via_external_group_id: vec![],
                 })),
             },
         );

crates/xmtp_mls/src/groups/intents.rs

@@ -1070,6 +1070,10 @@ impl From<AppDataUpdateIntentData> for Vec<u8> {
             version: Some(AppDataUpdateVersion::V1(AppDataUpdateDataV1 {
                 component_id: intent.component_id as u32,
                 payload: intent.payload,
+                // Multi-component atomic writes (XIP-82 enable atomicity)
+                // populate this in the external-commit stack; the generic
+                // single-component intent carries none.
+                additional_updates: vec![],
             })),
         }
         .encode_to_vec()
@@ -1170,6 +1174,7 @@ mod app_data_update_intent_tests {
             version: Some(AppDataUpdateVersion::V1(AppDataUpdateDataV1 {
                 component_id: u16::MAX as u32 + 1,
                 payload: vec![],
+                additional_updates: vec![],
             })),
         }
         .encode_to_vec();

crates/xmtp_mls/src/groups/mls_sync/update_group_membership.rs

@@ -91,12 +91,22 @@ pub(crate) fn build_group_membership_app_data_payload(
 
 /// Encode a per-inbox `GroupMembershipEntry::V1` value with the given
 /// `sequence_id` and an empty `failed_installations` list.
+///
+/// `admitted_via_external_group_id` is left absent here. That is only
+/// correct while nothing can set it: the field is written exclusively by
+/// the external-commit join path (XIP-82), which does not exist yet on
+/// this branch. The Update arm of [`build_group_membership_app_data_payload`]
+/// rewrites entries from scratch, so once joins can tag entries it MUST
+/// carry the existing tag through (the tag is write-once and validators
+/// will reject a member commit that clears it); that preservation lands
+/// together with the validator enforcement in the external-commit stack.
 fn encode_membership_entry(sequence_id: u64) -> Result<Vec<u8>, GroupError> {
     let entry = GroupMembershipEntry {
         version: Some(group_membership_entry::Version::V1(
             group_membership_entry::V1 {
                 sequence_id,
                 failed_installations: vec![],
+                admitted_via_external_group_id: vec![],
             },
         )),
     };

crates/xmtp_mls_common/Cargo.toml

@@ -22,6 +22,7 @@ prost.workspace = true
 serde.workspace = true
 thiserror.workspace = true
 tls_codec.workspace = true
+url.workspace = true
 xmtp-workspace-hack.workspace = true
 xmtp_common.workspace = true
 xmtp_configuration.workspace = true

crates/xmtp_mls_common/src/app_data/migration.rs

@@ -1169,13 +1169,15 @@ mod tests {
             GroupMembershipEntryV1 {
                 sequence_id: 42,
                 failed_installations: vec![vec![0xAA; 16]],
+                admitted_via_external_group_id: vec![],
             },
         );
         entries.insert(
             InboxId::from_bytes([0x02; 32]),
             GroupMembershipEntryV1 {
                 sequence_id: 99,
                 failed_installations: vec![],
+                admitted_via_external_group_id: vec![],
             },
         );
         let entries = entries
@@ -1257,6 +1259,7 @@ mod tests {
             version: Some(GroupMembershipEntryVersion::V1(GroupMembershipEntryV1 {
                 sequence_id: 7,
                 failed_installations: vec![],
+                admitted_via_external_group_id: vec![],
             })),
         };
         snapshot