parallel-decision: expose exact tree distributions

[kilo666mj]

Summary

• include the complete per-choice probability map for tree-scored fields
• omit the map for greedy fields, whose unvisited branches are not exact
• document the response contract and add a model-free assembly regression test

Motivation

The decision engine already computes the field probability vector in tree mode, but the HTTP response exposes only the winning value and probability. Returning the existing vector lets narrow adapters derive model-independent confidence without a second inference pass.

Verification

Built and ran the test-parallel-decision target from a fresh CMake build inside a Bubblewrap namespace with networking disabled. The test covers exact enum distributions and confirms greedy responses omit the probabilities map.

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