docs: add June 15th 2026 changelog entry

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Summary

Weekly changelog entry covering product changes shipped between June 12 and June 15, 2026.

Changes

• Service accounts: full CRUD with display name, soft-delete, super_admin role, and API-key-to-user association
• Customer hierarchy: validation prevents a child customer from being inherited under multiple parents
• Signup metadata: signup API and dashboard now accept structured metadata
• Improvements: event debugger attributed-to-customer step, commitment time bucket editor refinements, expanded subscription status filter, optional user name field
• Fixes: wallet idempotency returns 409, inheritance no longer admits parent-type child subscriptions
• API: new user update/delete endpoints, metadata on signup, breakdown_bucket on meter usage analytics, user_id / not_expired_at filters on secret list

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Project	Status	Preview	Updated (UTC)
flexprice	🟢 Ready	View Preview	Jun 15, 2026, 4:10 AM