Keep archived-card history truthful in synthetic demo mode

[Chris0Jeky]

Follow-up to PR #2932 comment 3982485255 at cd5ff22.

BoardCardArchive calls cardsApi.getArchivedCards for synthetic demo board IDs, while boardCrudStore supplies those boards locally. Opening Archived cards can fail against the backend instead of behaving as a demo control. The HTTP interceptor already suppresses demo 401 session clearing, so no session-loss path was demonstrated.

Residual acceptance: either hide archive history with an honest demo explanation or implement bounded local demo behavior; never issue archive-history network requests for a synthetic board. Cover Paper and Legacy presentation and preserve normal authenticated board behavior.

Confirmed MEDIUM, no production card mutation or persisted data loss. Serialize after #2932; no active claim.

[Chris0Jeky]

[Codex lane claim v2]
lane: alpha-product-trust
issue: #2940
base: 7695211
residual acceptance: synthetic demo archive history makes no backend requests and explains its unavailable history honestly in both shared Paper/Legacy presentations; normal authenticated archive history remains unchanged
owned paths/modules: BoardCardArchive.vue, BoardCardArchive.spec.ts, one focused demo archive browser regression if needed
shared-path leases: frontend/taskdeck-web/src/components/board/BoardCardArchive.vue; its focused component spec; dedicated demo browser spec
parallel-safe work: #2953 hierarchy owns CardArchiveAction/shared card editor and backend; no edits to those modules from this demo slice
open PRs/branches/review threads checked: #2932 merged; no open PR or active claim edits BoardCardArchive; #2953 writer notified of boundary; canonical docs/locales/store/API remain excluded
human or decision gates: none
status: active

Use the issue's accepted option of hiding synthetic archive history behind an honest demo explanation. Reproduce the unwanted request before repair. Keep the check in the shared component with a defensive handler guard; no fake local restore implementation. Prove demo no-network behavior, normal board history/retry and Paper/Legacy browser presentation, then frontend checks. No backend or archive lifecycle changes.

[Chris0Jeky]

[Codex lane release v2]
lane: alpha-product-trust
issue: #2940
PR: none
exact head: f8d8460
result: parked
shipped outcome: none; user redirected this session to hard implementations only
remaining residual: saved two-file demo explanation/no-network guard needs completed typecheck, build, lint, full frontend, Paper/Legacy browser proof, review and hosted CI; do not treat it as ready
released paths/leases: BoardCardArchive.vue, BoardCardArchive.spec.ts and demo browser lease; no active writer
next dependency now unblocked: none

CLAUDE_SYNC_PACKET
canonical truth changes: none
issue/project changes: #2940 remains open, return Pending/III; preservation branch issue-2940/demo-archive-history is pushed, no PR opened
architecture/decision impact: none
manual validation still needed: both demo browser journeys and all listed incomplete checks
human actions: none; parked by prioritization, not a new decision gate

Exact restart: reconcile saved head with current main and current shared archive component leases; preserve the six focused regressions, then complete missing checks before review. Red proof had two failures/four passes and three unwanted API calls; focused post-fix passes6. Docs/link/diff checks passed. Typecheck/full suite were interrupted on the user's priority change; partial localhost:5000 diagnostics have no suite verdict. Evidence and resume: C:\Users\Public\codex-shell-home\taskdeck-2940-evidence\RESUME.md. Clean worktree removed after evidence inventory; no owned servers remain.

[Chris0Jeky]

[Codex lane claim v2 — resumed preservation]
lane: alpha-product-trust
base: b4cd617
preserved source: issue-2940/demo-archive-history @ f8d8460dbac6c311847e454964dd279a5ed828a4
owned paths: frontend/taskdeck-web/src/components/board/BoardCardArchive.vue, frontend/taskdeck-web/src/tests/components/BoardCardArchive.spec.ts
shared-path leases: exact two files only; no BoardView, store, API, locale, backend, archive lifecycle, or browser-suite edits
parallel safety: prior lane released these paths with no active writer; current main still has byte-compatible source seams. The shared-component source contract will prove BoardCardArchive is rendered before the Paper/Legacy split, avoiding a broad BoardView spec lease.
status: active. Rebuild the preserved red-first tests on current main, observe exact-head failure, then reapply the five-line no-network/honest-explanation guard and complete frontend qualification/review.

[Chris0Jeky]

[Codex lane release v2]

• Lane: demo-archive-integrity
• PR: Keep demo archive history offline and truthful #3152 — ready for maintainer review
• Exact head: 7b468ac890138032dd5579c5be69461471bb4503
• Scope: three files only (BoardCardArchive.vue, focused component regression, mounted Paper/Legacy BoardView regression)
• Required CI: 35390934792 passed, including Playwright smoke
• Extended CI: 35390935062 passed
• Smart CI: 35390934616 passed
• Review: substantive diff reviewed with no findings; no unresolved review threads
• Result: synthetic demo boards expose an honest offline archive-history explanation and issue no archive-history reads or restore writes; authenticated boards retain normal behavior

The lane is released. No merge was performed.