WEB-001A2: record isolated Firebase staging deployment

[daliu]

Summary

• Record the club-owned run-mprc-staging Firebase project and first static Hosting release.
• Document exact source/version and signed-out desktop, phone, direct-route, and empty-data readback.
• Preserve the boundary: staging has no backend/provider test estate, protected release authority, marker, rollback, security-header policy, or production role.

Officer impact: Officers now have a clear, public status for engineering staging and a firm warning not to sign in, enter data, deploy, or treat it as production or a fallback.

Officer documentation: OFFICER_START_HERE.md; docs/officers/PUBLISH_AND_CHECK.md; docs/officers/SYSTEM_MAPS.md; docs/officers/ACCESS_CONTINUITY.md; docs/officers/EMERGENCY_AND_RECOVERY.md; docs/officers/GLOSSARY.md

Deployment evidence: Website — https://run-mprc-staging.web.app and direct /events returned 200; signed-out desktop and 390px phone rendering/navigation passed with no broken images or horizontal overflow; empty staging Events settled to the fixed no-events state. Firebase — project run-mprc-staging, one web app, finalized Hosting version 3ffadcf2ac8cc760 from exact merged source a614c68; live channel released 2026-08-26T16:53:11.810Z. Provider surfaces — production Firebase Hosting still returns 404; runmprc.com/Netlify, GitHub Pages, DNS, backend services, provider sandboxes, accounts, sign-in, and production data were not changed.

Verification

• Node 20.20.2: npm run test:firebase-hosting — 7/7 passed.
• Exact staging build and Hosting predeploy validation passed before publication.
• Executable artifact contained the staging identity and no known production Firebase identity.
• Provider readback: staging root 200, staging /events 200, production Firebase Hosting 404.
• git diff --check passed; generated public/sitemap.xml was restored and is unchanged.

Closes #665

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[daliu]

Self-review completed on exact head 3bde951. No blocking findings. The diff is documentation-only, leaves public/sitemap.xml unchanged, records exact staging provider/UI evidence, and explicitly preserves the no-sign-in/no-backend/no-production boundary. Node 20 Hosting contract tests passed 7/7 and all PR checks are green.