PR_26175_ALFA_016: consolidate Alfa parent child table runtime changes

[ToolboxAid]

Summary

• Consolidates current-main-safe runtime work from PRs PR_26174_ALFA_009-game-hub-parent-child-table-layout #103, PR_26174_ALFA_010-game-hub-source-idea-child-table-polish #104, and PR_26174_ALFA_011-game-hub-readiness-output-child-table #105.
• Marks the Game Hub Games table as the Open Games parent table and adds an Open Games caption.
• Adds the missing Game Summary child table while preserving Source Idea and Readiness Output as separate child tables.
• Leaves status bar work untouched.

Reports

• docs_build/dev/reports/PR_26175_ALFA_016-alfa-parent-child-table-consolidation.md
• docs_build/dev/reports/codex_changed_files.txt
• docs_build/dev/reports/codex_review.diff
• ZIP: tmp/PR_26175_ALFA_016-alfa-parent-child-table-consolidation_delta.zip

Validation

• PASS: node --check toolbox/game-hub/game-hub.js
• PASS: node --check tests/playwright/tools/GameHubMockRepository.spec.mjs
• PASS: node --check tests/playwright/tools/IdeaBoardTableNotes.spec.mjs
• PASS: git diff --check
• PASS: inline style guard returned no matches for scoped files.
• PASS: status bar scope check returned no diff.
• BLOCKED: Playwright browser lane was not run because Chromium is missing at C:\Users\davidq\AppData\Local\ms-playwright\chromium-1217\chrome-win64\chrome.exe. Per instruction, Chromium was not installed.