chore(review): converge 9 hand-duplicated src/review/ files onto their @loopover/engine shims

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Context

Part of the src/ ↔ @loopover/engine convergence epic (#6202). 9 files in src/review/ are byte-identical (or near-identical, modulo an import-path/doc-comment delta already confirmed via diff) duplicates of the same-named file at packages/loopover-engine/src/review/<file> — full copies that should be thin re-export shims instead, matching the pattern already proven for src/settings/auto-close-exempt.ts, moderation-rules.ts, global-contributor-cap.ts, and src/signals/duplicate-winner.ts.

Affected files (all in src/review/, each with an identical-path counterpart in packages/loopover-engine/src/review/):

• advisory-ai-routing-config.ts
• cla-check.ts
• enrichment-analyzer-names.ts
• guardrail-config.ts
• linked-issue-hard-rules-config.ts
• linked-issue-label-propagation.ts
• pre-merge-checks.ts
• screenshot-table-gate.ts
• unlinked-issue-guardrail-config.ts

Requirements

• Convert each of the 9 src/review/<file> copies into a thin re-export shim of its packages/loopover-engine/src/review/<file> counterpart, following the exact shape already used by src/settings/auto-close-exempt.ts (or any of the other 3 already-correct shim examples).
• Do not change any of the 9 engine-side files — they remain the canonical implementation.
• Before converting each pair, re-confirm via a fresh diff that the two copies are still equivalent (no src/-side-only behavior added since this audit) — if one genuinely diverges, note it in the PR and skip converting that specific file rather than silently dropping real behavior.
• Update every import site across src/** that currently imports the src/review/<file> path directly, if the shim's export shape requires it (it shouldn't, if the re-export is a faithful export * from / named re-export, but verify no call site breaks).

Test Coverage Requirements

99%+ Codecov patch coverage on the changed files; every existing test for both the src/review/ copies and their engine counterparts must continue passing unchanged — a shim conversion is a behavior-preserving refactor, not a functional change.

Deliverables

• All 9 files converted to thin re-export shims.
• All existing tests for the 9 files (and any downstream importers) pass unchanged.

Expected Outcome

src/review/ no longer hand-duplicates 9 files that already have a canonical implementation in @loopover/engine — a future fix to any of them only needs to happen once.

Links & Resources

• Epic: converge remaining 15 hand-duplicated src/ <-> @loopover/engine files onto thin re-export shims #6202 (parent epic)
• #4879 (original convergence effort)
• src/settings/auto-close-exempt.ts (the shim pattern to replicate)
• packages/loopover-engine/src/review/ (the 9 canonical counterparts)

[linear-code]

JSO-4306