Protective-block mechanism undesigned; principles now fixed (D50). Safety-critical and carries legal exposure: presence-shielding across every surface (attendee lists, people steps, counts — an attentive blocked person comparing counts to heads), what the blocker may see of the blocked (safety need vs. reverse-surveillance by a false "victim"), mutual/contested blocks, interaction with enforcement and contributor rating, and the capture-time routing that gets a person in danger to the block tier without demanding disclosure.
Files matching.md, user-model.md, Group 4
Severity high
Status fixed — D52, designed in protective-blocks.md: rendered-world rule (counts adjusted, unconditional invisibility); ordinary-power blocker view with awareness/peace choice + itinerary alert; displacement handled (free yields, pattern watch); co-presence stated as the fiction's limit; block ≠ accusation; informed-choice roster for blocked organisers; env-local (D42 unqualified). Advocate validation planned before build