Slides Polish: Per-Page Codex Review + Targeted Layout Fixes

Before each reviewer slot, follow Selectable Reviewers: resolve invocation → .aris/reviewer.json → Codex default (fresh native reviewer) with reviewer_route.py through the canonical helper resolver, preserving this slot's tier, fresh contexts, source/image inputs and deterministic gates. Codex examples/pins below apply only to backend=codex; other routes use their own first-call/reply contract. Save the route and actual returned identity; unavailable selections are REVIEW_UNAVAILABLE. Classify acceptance from actual families/completion/scope. Forward invocation reviewer/model/effort overrides to reviewer-bearing children. Generation workers are unchanged.

Polish a generated slide deck — Beamer (.tex + .pdf) and/or PPTX — by running per-page Codex review against a reference visual and applying surgical fixes (font scaling, text-frame resize, callout-box style, em-dash spacing, anonymity placeholders, Chinese-font hints, italic style leaks) until each slide reads at the same visual weight as the reference.