feat(review): render single-line ```suggestion block on inline comments

[JSONbored]

Render an InlineFinding's suggestion as a GitHub native single-line ```suggestion block appended to the inline comment body, so a contributor can commit the fix in one click. Single-line only (the finding's anchored RIGHT-side line); multi-line ranges are a separate slice.

Deliverables

• Extend formatInlineBody (src/review/inline-comments.ts:71) to append a fenced suggestion\n<text>\n block when finding.suggestion is set
• Keep public-safe: the suggestion text is already filtered by composeInlineFindings before it reaches here
• No block when suggestion is absent (behavior byte-identical to today)
• Tests: with/without suggestion (both branches), fence formatting, multi-line suggestion text preserved verbatim, severity label still leads the body

References

• src/review/inline-comments.ts:71
• src/review/inline-comments.ts:94
• part of #1956

Part of #1956.

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

[linear-code]

JSO-2241