feat(review): show finding category label on inline comments

[JSONbored]

Surface each finding's category in the inline comment label, e.g. **Blocker · security:**, so contributors see the finding class inline. Rendering-only slice on top of the category schema.

Deliverables

• Extend formatInlineBody (src/review/inline-comments.ts:71) to include the category next to the severity label
• Human-readable category name (title-cased), omitted cleanly when category is absent (defensive)
• Tests: blocker+category, nit+category, missing category → severity-only label (both branches)

References

• src/review/inline-comments.ts:71
• src/services/ai-review.ts:215
• part of #1958

Part of #1958.

---

size: XS · held for later release (gittensor:bug once activated)

[linear-code]

JSO-2251