verify-no-regressionslisted

# Verify No Regressions Usage: `/verify-no-regressions [count] [base-branch]` (defaults: 1 main) ## Work state - Working tree: !`git status --short 2>/dev/null || echo "(not a git repo)"` - Commits ahead of base: !`set -- $ARGUMENTS; git log --oneline "${2:-main}"...HEAD 2>/dev/null || echo "(none or invalid base)"` - Committed diff: !`set -- $ARGUMENTS; git diff --stat "${2:-main}"...HEAD 2>/dev/null` - Staged diff: !`git diff --cached --stat 2>/dev/null` - Unstaged diff: !`git diff --stat 2>/dev/null` - Test scripts: !`cat package.json 2>/dev/null | jq -r '.scripts | to_entries[] | select(.key | test("test";"i")) | "\(.key): \(.value)"' 2>/dev/null || echo "(no package.json)"` ## Instructions Read the work state above to determine what happened: - **Committed**: commits ahead of base, clean working tree → review with `git diff base...HEAD` - **Staged**: files in staging → review with `git diff --cached` - **Unstaged/untracked**: modified or new files → review working tree files directly - **Mixed**: combination of the above → review all layers If nothing changed anywhere, report that and stop. Spawn the subagents in a **single message**. Tell each agent which diff commands to use based on the work state. 1. **Semantic reviewers** (`model: opus` -- judgment-heavy: intent, not syntax) -- split changed files across `$0` agent(s) (default: 1). Each agent: - Reads the diff (using the appropriate command for the work state) and current file contents - Classifies eac