[Afloat16]

What & why

Each Responses text/tool-argument delta copied previously accumulated output, repeatedly copying growing answer, reasoning and tool-argument prefixes.

Append to the JSON-owned string in place, preserving geometric growth and existing event/complete-response structure.

Area

Engine, CLI or server (edge0-infer/).

How was it tested?

moe_test_serve_protocol tests/fixtures/portal/requests.json

The target and request/event fixtures pass. Three regressions append 256 chunks of 1024 bytes and verify the exact 262144-byte result. Each fixed path makes 4 allocations of at least 32 KiB; the original answer path makes 464 and fails the bound. Model throughput was not measured.

All 14 L0 checks passed in a local integration with the other focused fixes. git diff --check passed.

Local C++ environment: Linux x86_64, GCC 14.2, CPU preset. Targeted builds downgrade pre-existing ignored-attributes, dangling-reference, range-loop-construct and misleading-indentation warnings (plus maybe-uninitialized in the existing diagnostics source); these accommodations are not source changes. The all-target build is blocked by existing assets_test.cpp use of std::count_if without . A clean full L0/L1 result, GPU tests and model-asset execution are not claimed.

Checklist

• Full ctest --preset cpu -L "L0|L1" passes locally
• Added/updated focused regressions and ran the affected target
• No public interface/configuration change requiring additional documentation