feat: add public deck geometry review workspace

[FHoffarth]

Summary

• Human Review Workspace: Created a dedicated review interface for Decks 5, 6, and 7 to visually compare official source drawings (ART-0001 Page 3) against extracted vector geometries.
• Fail-Closed Dual-Gate Governance: Integrated the review finalization directly with canonical Gatekeeper rules via is_canonical_statement_admitted() in timonelo.evidence.gatekeeper. Geometry acceptance approves visual bounds, but publication is strictly withheld until statement identity admission is confirmed.
• Reviewer Identity Integrity: Eliminated phantom reviewers (UNSPECIFIED_REVIEWER, human_curator, etc.). Finalization strictly requires an explicit reviewer name.
• Dev-Only Route & Asset Isolation: The review tool is code-split and accessible only in dev mode (import.meta.env.DEV). frontend/dist/ contains 0 bytes of ART-0001 review imagery.
• Initial Baseline Cleanliness: All 71 candidate objects on Decks 5, 6, and 7 remain unadmitted in DRAFT / UNKNOWN / PUBLISH_BLOCKED state. Passenger exposure remains strictly limited to Deck 14.

Tests & CI Coverage

• Frontend Vitest Suite: 91/91 tests passing (including 15 review boundary and invariant tests).
• Frontend Build: Clean Vite production build with zero review assets bundled in dist/.
• Backend Test Suite: 899/899 pytest tests passing across 73 test suites.
• Diff Hygiene: git diff --check is clean (0 whitespace warnings).