feat(review): review.suggestions config toggle (default off) gating suggested-change blocks

[JSONbored]

Add a per-repo review.suggestions manifest toggle (default OFF) that gates whether ```suggestion blocks are emitted, layered on top of the existing inline-comment three-gate. Mirrors the shouldRequestInlineFindings toggle pattern so suggestions never surface unless a maintainer opts in.

Deliverables

• Add a pure shouldRenderSuggestions(inlineEnabled, manifestSuggestionsToggle) helper in src/review/inline-comments.ts alongside shouldRequestInlineFindings (src/review/inline-comments.ts:29)
• Thread the resolved boolean into formatInlineBody/selectInlineComments so a suggestion block is only appended when both inline-comments AND suggestions are on
• Default OFF: suggestions never render unless the manifest toggle is true
• Tests: toggle on+inline on → suggestion; toggle off → plain comment; inline off → nothing (both branches of the AND)

References

• src/review/inline-comments.ts:21
• src/review/inline-comments.ts:29
• part of #1956

Part of #1956.

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

[linear-code]

JSO-2244