PR_26175_OWNER_053: add Alfa stack resolution plan

[ToolboxAid]

Summary

• Adds the OWNER_053 report-only Alfa stack resolution plan for PRs PR_26174_ALFA_002-game-hub-project-intake-display #96 through PR_26174_ALFA_EOD-final-closeout #118.
• Documents the dependency chain, per-PR status, runtime impact, merge candidates, superseded candidates, hold candidates, and final recommended merge order.
• Confirms PR_26174_ALFA_EOD-final-closeout #118 only supersedes closeout/reporting portions, not runtime stack work, and recommends PR_26174_ALFA_EOD-workstream-closeout #117 remain archive-only.

Reports

• docs_build/dev/reports/PR_26175_OWNER_053-alfa-stack-resolution-plan.md
• docs_build/dev/reports/codex_review.diff
• docs_build/dev/reports/codex_changed_files.txt

Validation

• Started from clean, synced main.
• Read all files under docs_build/dev/ProjectInstructions/.
• Used GitHub PR metadata for PR_26174_ALFA_001-idea-board-create-project-api-contract #95 and PR_26174_ALFA_002-game-hub-project-intake-display #96 through PR_26174_ALFA_EOD-final-closeout #118.
• git diff --check.
• git diff --cached --check.
• tar -tf tmp/PR_26175_OWNER_053-alfa-stack-resolution-plan_delta.zip.

No runtime code changes. No PRs merged or closed. No branches deleted.

[ToolboxAid]

OWNER-approved closure: superseded by merged consolidated Alfa PRs #146, #148, #149, #150 and subsequent old-Alfa closure execution, now recorded by OWNER_055 #156. No branch deletion requested.