Design briefs went into $D variants/generate/check as a double-quoted
argument, and approval feedback was spliced into a single-quoted echo of JSON,
so a quote, backtick or $(...) in either broke the command or ran. The agent
now writes each brief into a private .gstack/tmp file and the block passes
--brief "$(cat "$BRIEF_FILE")" (the CLI's --brief-file expects a JSON
brief, so plain text uses --brief). variants and the later check reuse the
same brief file. approved.json is built with jq -n from --arg values and
--rawfile feedback, so the feedback is data. The office-hours mockup flow
creates its brief and feedback files in one block.
design-approval-flow now writes the feedback file (with quotes, backticks and
$(...) in it) instead of substituting <FEEDBACK>, and checks the file is
removed after the save.
Co-authored-by: dgrant <dgrant@users.noreply.github.com>
