R-Plan Layer 2 architecture LOCKED 2026-04-28 (re-record for tag schem…

Decision

R-Plan Layer 2 architecture LOCKED 2026-04-28 (re-record for tag schema compliance — prior call cfde777c had XML escaping mishap on tags param).

Rationale

Reasoning chain on session b09bb29c (4 thoughts: analysis on L3-SAP keystone + evaluation on stack-lock low-risk + 6-mode premortem with mitigations + conclusion on durability). All architecture choices blessed-stack defaults. Frappe Gantt swap to Bryntum is UI-only refactor if needed. Awaiting AJ green-light for repo creation. architecture,real-estate,reversible,st-derived

Alternatives Rejected

Outcome

Pending