revisão e complementação da documentação do projeto

docs/adr/ADR-004-context-never-elevates-privilege.en-us.md

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+# ADR-004: Agentic context never elevates privilege
+
+**Status:** Accepted.
+**Source:** this ADR is the canonical record of this decision. For implementation and validation context, see `RI/docs/AS-BUILT.md` and, where applicable, the relevant contract in `RI/docs/interfaces/`.
+
+## Context
+
+Can agentic context elevate privilege?
+
+## Decision
+
+Never — context can only subtract (`Context may subtract, must never add`).
+
+## Alternatives Considered
+
+Allowing elevation based on the model's "confidence."
+
+## Consequences
+
+EP-15 tests (Test 3/4) validate the invariant.