refactor(data-mode): drop redundant statusLabel and dead workbenchDataModeLabel helper

[DeliciousBuding]

Hard-evidence subtraction on the WorkbenchDataModeContract policy table, per the read-only audit. Full-table ablation is a NEGATIVE experiment — the centralized policy SSOT is KEPT (all boolean fields are derivable from mode but are a real multi-consumer single policy source; abating would fragment policy across desktop/web/gate call sites). allowsMockData and allowsFixtureData are also KEPT (live consumers in shared/src/testing/e2eDataModeContract.ts E2E validator).

This PR removes only:

• redundant WorkbenchDataModeContract.statusLabel (=== mode for all 5 literals): interface field + 5 table entries; Desktop/Web model read .mode instead (value/type identical).
• dead workbenchDataModeLabel helper: definition, demo/index.ts re-export, test import/assertions. normalize-exact-input coverage preserved as normalizeWorkbenchDataMode("auto"/"demo+edge"/"mock (auto fallback)") === "auto".

Preserved unchanged: mode literal type, all remaining policy booleans, observed/approved-real semantics, normalization aliases, storage/override/env runtime behavior.

Net: 5 files +8/-24.

Verification: shared dataMode 5/5; desktop model 13/13; web model 40/40; shared/desktop/web typecheck PASS; git diff --check PASS; canonical coverage baseline shared (lines 90.26, uncovered 1) PASS, web (lines 70.13) PASS, desktop (lines 66.32) PASS, all zero-skipped/no-regression.

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