[daliu]

Members can distinguish current free-event availability from stored signup history, and an uncertain refresh no longer leaves old active status or new-action controls visible.

Officer impact: Clear cancelled/closed/full/not-yet-open/ended messages and safe refresh/saved retry in the existing staging member page. No event/registration/refund policy changes.
Officer documentation: docs/officers/STAGING_COMMUNITY.md, docs/officers/SYSTEM_MAPS.md with text alternative, SYSTEM_DESIGN.md, OPERATIONS_RUNBOOK.md, GITHUB_ISSUES.md. New procedure remains NOT AVAILABLE YET pending native acceptance.
Deployment evidence: None for this change yet. Exact backend-first staging Function archive/settings/unchanged-profile/IAM/security, dependent Hosting and disposable native UI/failure/cleanup checks remain required under #724. No production/runmprc.com or real payment release.

Review

• Ten source/test/doc files plus one existing emulator test changed; no new dependency/workflow/service or IAM/Rules/resource change.
• Existing validated event fields/capacity and after-read server clock add a closed response-only signupStatus enum. Old clients may ignore it; new UI fails closed on missing/unknown states. No stored schema or backfill.
• Existing transactional joins/cancellation, strict inputs, Auth/App Check, revision/rate/idempotency checks and audit/waiver/payment evidence remain unchanged. Display fields cannot be injected into a join command.
• Cancelled event is explicit while confirmed history and own cancellation remain separate. No automatic cancellation/count rewrite/refund.
• Clear old snapshot/consent while reading and after uncertainty; preserve exact saved retry and account/provider-generation fencing. No polling.

Checks

• Valid regressions before fix: backend9 fail/28 pass, frontend9 fail/9 pass. An initial frontend test-placement error was corrected before this baseline; it was not product-defect evidence.
• Backend focused83 pass before the final input-injection test; full backend77 suites/7,793 pass (69 emulator-only skipped in that run). The added emulator test is checked separately/native CI; no skipped test is claimed hosted proof.
• Full frontend21 suites/1,385 pass. TypeScript/backend lint and strict frontend126-file/113-error/6-warning baseline pass after correcting new test formatting; baseline untouched.
• Release/authority contracts51 pass; whitespace clean.
• Java21.0.12 exists; first emulator attempt did not start because Java was missing from PATH. Corrected command uses that existing runtime, no installation.
• The first running emulator suite hit the older membership test's five-second default, with unfinished work affecting later tests. Corrected that integration-only allowance to45s (same existing concurrency limit) and reset each test's clock; no assertion/production guard weakened. The full bounded demo suite then passed6/6 and both emulators shut down.
• Native deployment, actual member screen/failure/retry and exact owned cleanup remain next gates. No fresh financial/refund/transfer or production proof is claimed.

Refs #724. Do not auto-close before native acceptance and current handoff. Full backend goal stays active.

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