Mac push: A file in the chat's folder is not called outside through a linked path (from #2038) #2054

This draft was closed, unmerged, when the 2026-10-29 Mac stability and performance push was stopped early to save usage. Its branch is kept: reopen the PR or start from the branch, rebase onto the latest base, and finish the steps below.

PR: #2038 (app: a file in the chat's folder is not called outside through a linked path)
Branch: fix/app-file-stat-alias

What it fixes. The app's file stat and agent listing compared a chat folder and a file by spelling, so a file inside the folder looked outside it through a linked path on macOS.

Done. Implementation and tests.

Left. Rebase onto the latest app/v3 (it touches cmd/codeaf); full Mac go test ./... vs base; CI comparison; a Codex round; reachability evidence.

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