feat(review): dedupe identical inline findings across dual reviewers before rendering

[JSONbored]

In dual/consensus review, the two models can emit the same line-anchored finding, producing duplicate inline comments (selectInlineComments only dedupes by path+line AFTER compose, dropping the second silently). Merge near-identical findings on the same line in composeInlineFindings, preferring the higher severity and keeping any suggestion/category — cleaner surface, fewer dropped notes.

Deliverables

• In composeInlineFindings (src/services/ai-review.ts:841) merge findings with the same (path,line): keep the max severity, prefer a present suggestion/category
• Preserve the existing per-line ordering + cap semantics
• Do not change gate behavior (compose is advisory-only)
• Tests: two models same line different severity → merged max, distinct lines untouched, suggestion carried from whichever model had it (all branches)

References

• src/services/ai-review.ts:841
• src/review/inline-comments.ts:79
• part of #1956

Part of #1956.

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size: S · held for later release (gittensor:feature once activated)

[linear-code]

JSO-2259