merge staging: resolve chat_files.go in favor of PR-B+C version

Conflict between PR #2311's revert of PR #2309's external-runtime gate
(which kept the original docker-exec Upload) and PR-B's branch (which
contains PR-C's HTTP-forward rewrite via stack consolidation).

PR-C supersedes both — the docker-exec path is gone entirely. Taking
HEAD (PR-B+C combined) is the correct resolution.

Build + chat_files tests both green after resolution.
This commit is contained in:
Hongming Wang 2026-04-29 15:36:13 -07:00
commit 51603c7b0a

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