fix: default register client id

openspec/changes/fix-register-body-validation/.comet.yaml

@@ -0,0 +1,19 @@
+workflow: hotfix
+phase: build
+context_compression: off
+build_mode: direct
+build_pause: null
+subagent_dispatch: null
+tdd_mode: direct
+isolation: branch
+verify_mode: light
+auto_transition: true
+base_ref: 2f7597ed53736b965191d4e48ee2c73d09ff71c0
+design_doc: null
+plan: null
+verify_result: pending
+verification_report: null
+branch_status: pending
+created_at: 2026-08-14
+verified_at: null
+archived: false