test(p8-a3.1): prototype typed evidence report at internal boundary

[aetherxeg-source]

Purpose

Execute R0-R3 of #149 as a test-only research prototype.

Design

The prototype is compiled only under cfg(test) and consumes the internal BackendObservation boundary directly, before the public raw-v2 return path discards typed collection-health information.

It emits a deterministic research report containing only already-known metadata:

• recognized backend/profile identity;
• typed collection health;
• warning codes;
• unsupported capabilities;
• bounded successful fd-write propositions and guarantees;
• explicit non-claims.

Non-expansion boundary

No new acquisition is added. The prototype does not collect or claim:

• file contents;
• exact byte counts;
• before/after state roots;
• custody/trusted time;
• signatures as behavioral authority;
• source-code provenance.

No public CLI, Action, baseline, policy, verdict, or raw-v2 schema is changed.

Tests

R0-R3 cover deterministic output, incomplete/ambiguous health, unsupported capability, laundering attacks, backend-name inflation, missing capability, process binding, repeated effects, profile mismatch, and a live Linux x86_64 native ptrace write path.

R4 remains full CI + P9.3 compatibility before any R5 decision.