Update HIP-1398 metadata and discussion links

Signed-off-by: Michael Garber <michael.garber@hashgraph.com>

Author: mgarbs

HIP/hip-1398.md

@@ -4,16 +4,16 @@ title: TSS Ceremony
 author: Joseph Sinclair <@jsync-swirlds>, Rohit Sinha <@rsinha> 
 requested-by: Hashgraph
 type: Standards Track
-category: TBD
+category: Core
 needs-hiero-approval: Yes
 needs-hedera-review: Yes
 hedera-review-date: 
 hedera-acceptance-decision: 
 status: Last Call
-last-call-date-time: TBD
+last-call-date-time: 2026-03-17T07:00:00Z
 created: 2026-01-20
-discussions-to: https://github.com/hiero-ledger/hiero-improvement-proposals/discussions/xyz
-updated: 2026-02-25
+discussions-to: https://github.com/hiero-ledger/hiero-improvement-proposals/pull/1398
+updated: 2026-03-03
 ---
 
 ## Abstract