[steve8708]

Changes

• Pre-scan the lazy Design Code Workbench so Monaco dependencies are ready before the first browser load.
• Read grouped-grid item geometry in one preview-frame evaluation, avoiding races during reload.
• Strip only connector-added Slack thread trailers after valid reaction or file metadata, preserving the metadata used by the feedback inventory.

Verification

• templates/design/e2e/grouped-grid-drop.spec.ts: 1 passed, including drag, undo, redo, and reload.
• templates/design/e2e/code-workbench-local-files.spec.ts: 1 passed, including language selection and consented save.
• Feedback inventory checker self-test: 244 negative cases, 39 positive inventory cases, 6 source-evidence cases, 6 handoff cases, and 8 scope-gate cases passed.
• pnpm guards: all 93 checks passed.
• oxfmt --check and git diff --check passed.

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[builder-io-integration]

Builder reviewed your changes and has a few items to flag 🟡

Review Details

Incremental review of PR #8176 at the latest head. The changes still comprise the Design Workbench dependency pre-scan, grouped-grid geometry checks, and Slack feedback-inventory trailer parsing. Standard risk: the parser affects inventory output, while the remaining changes support test/development stability. The previous medium finding is fixed: waitForTargetGridBoxes now polls until the preview has rendered all nodes, and its review thread has been resolved. The one-evaluation measurement and extracted metadata parsers remain sound overall; I found no new high- or medium-severity issues.

New findings

• ⚪ LOW — The trailer regex does not handle CRLF-delimited messages, so the notification trailer and preceding workflow reaction may remain unparsed.
• ⚪ LOW — A user-authored line that exactly resembles valid Files:/Reactions: metadata may be reclassified as metadata when followed by an App notification trailer.

🧪 Browser testing: Skipped — the browser-test planner is unavailable; the current changes do not affect user-facing UI behavior.