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"body": "In #550 we bring the Eval suite back in shape. This is one of a series of PR's addressing some initial findings running it.\r\n\r\nThis addresses item 5 of the evolve-loop convergence follow-ups (`apps/eval/wip/eval-suite-findings.md` on `jp/eval-fixes`). Companion to #551–#554.\r\n\r\n## Problem\r\n\r\nObserved in eval case 44: the model called `edit_nix_file action=set path=inputs.home-manager` with an attrset value while `inputs = { … }` already existed. `set_value` only matched a *flat* dotted LHS, so it fell back to inserting a top-level `inputs.home-manager = \"…\"` — which (a) conflicts with the existing `inputs` binding (`error: attribute 'inputs' already defined`; Nix forbids mixing `inputs = {…}` and `inputs.x = …` at one level) and (b) rendered the attrset value, passed as a string, as a quoted string literal. The model then burned its remaining iterations repairing the damage and hit `limitReached` anyway.\r\n\r\n## Changes (2 commits)\r\n\r\n1. **AST-aware `set`** (reusing the resolver `add()` already has):\r\n - a leaf nested inside an attrset literal (`inputs = { nixpkgs = { url = …; }; }` + set `inputs.nixpkgs.url`) is replaced in place;\r\n - a new dotted path whose prefix is already bound to an attrset literal is merged *inside* that block (multiline indentation preserved);\r\n - a prefix bound to a non-attrset value (`inputs = import ./x.nix`) is refused with a clear error instead of silently corrupting.\r\n2. **String-value guard:** a string value that parses as Nix attrset/list syntax is rejected with guidance to pass structured JSON. Ordinary strings — including braced prose that isn't valid Nix — pass through unchanged.\r\n\r\n## Testing\r\n\r\n6 new unit tests replicating the exact case-44 file shape (merge without duplicate `inputs`, in-place nested replace, non-attrset prefix refusal, stringified-attrset rejection, braced-prose passthrough), plus the existing 31 editor tests all green. Full `cargo test` green except the 2 pre-existing sandbox-only failures. End-to-end effect will show in the next full 28-case sweep.\n",
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"body": "Thank you Scott! I think the UI and general app dynamics are achieving a pretty decent level of polish, so it is a good time for me to focus on this a bit more.",
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