PR_26175_OWNER_054: add Alfa consolidated batch closeout plan

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Summary

• Adds OWNER_054 closeout plan for consolidated Alfa PRs PR_26175_ALFA_015: consolidate Alfa foundation runtime changes #146, PR_26175_ALFA_016: consolidate Alfa parent child table runtime changes #148, PR_26175_ALFA_017: consolidate Alfa Game Hub interaction runtime changes #149, and PR_26175_ALFA_018: consolidate Alfa Idea Board polish runtime changes #150.
• Maps old Alfa PRs PR_26174_ALFA_002-game-hub-project-intake-display #96 through PR_26174_ALFA_EOD-final-closeout #118 to superseded/hold decisions.
• Documents blockers: draft state, generated report conflicts, PR_26175_ALFA_016: consolidate Alfa parent child table runtime changes #148 semantic decision, and browser validation availability.

Validation

• git pull --ff-only before branch creation
• GitHub PR inventory review via gh pr view
• Non-destructive git merge-tree conflict checks
• git diff --check
• Repo-structured ZIP: tmp/PR_26175_OWNER_054-alfa-consolidated-batch-closeout-plan_delta.zip

No PRs were merged or closed, no branches were deleted, and no runtime code was modified.

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OWNER-approved closure: superseded by the executed consolidated Alfa merge/closure work and merged OWNER_055 action plan #156. No branch deletion requested.