v0.5.2

release: anda_hippocampus v0.5.2

- User init routed through RecallAgent::get_or_init_counterparty (was MemoryManagement::get_or_init_caller)
- GetOrInitUserInput.user type relaxed: Principal → String
- Space.recall now pub
- local_date_hour() replaces rfc3339_datetime() across all three agents
- SYSTEM_PROMPT_DYNAMIC_BOUNDARY removed from agent prompts
- Prompt section labels consistently capitalized
- anda_engine 0.12.2 → 0.12.6, crypto-common 0.1.6 → 0.1.7, hybrid-array 0.4.11 → 0.4.12

Co-Authored-By: Anda Bot <noreply@anda.bot>