feat(review): make interactive PR design reproducible

[christso]

Summary

Interactive PR reviews now reproduce the same editorial hierarchy for any pull request: intent and verdict first, bounded business context and an optional mental model next, then filterable findings. The design comes from a validated presentation contract instead of one-off HTML, while existing review workspaces and finding lifecycle state remain compatible.

Design

• A bounded interactive-presentation.json sidecar carries review-specific editorial content into the shared renderer.
• The shared shell uses a sticky desktop review map and a single-column mobile layout, with heavy requirements, evidence, code, and lifecycle history collapsed by default.
• Presentation metadata survives same-commit regeneration, resets when the reviewed commit changes, and rejects malformed persisted or supplied values.
• Search and status filters keep the finding rail aligned with visible targets. Keyboard users can skip directly to findings.

Validation

• bun run test — 1,476 passed, 5 skipped, 0 failed.
• bun run typecheck — passed.
• bun run build — passed.
• Browser-tested the generated review at desktop and 390×844 mobile sizes. Confirmed responsive layout, no document-level horizontal overflow, collapsed heavy details, filtered navigation targets, and the empty-results state.

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