fix(cli): unescape dollar-prefixed object keys in jsonExample

[jsklan]

Description

Refs: Reported by @jsklan

When an OpenAPI spec contains $ref (or any $-prefixed key) as a literal object key inside an example (not as a JSON reference), the Fern CLI correctly escapes it to \$ref in the Fern definition to avoid collision with the $ example reference prefix. However, when converting back from Fern definition → IR, the backslash was not stripped from object keys in the jsonExample field — only from string values. This caused downstream generators (e.g. Go) to emit invalid code like "\$ref".

Link to Devin run | Requested by: @jsklan

Changes Made

• ExampleResolver.ts: Added key unescaping in resolveAllReferencesInExample when iterating object entries. Keys starting with \$ are stripped of the leading backslash, matching the existing unescaping logic already applied to string values (lines 45–49 in the same method).
• versions.yml: Added changelog entry for CLI v3.79.3.

Testing

• Unit tests added/updated — no tests were added; this is worth flagging
• Manual review of the escaping/unescaping roundtrip logic

Human Review Checklist

• Verify the new key unescaping mirrors the existing value unescaping pattern at lines 45–49 of the same method
• Consider whether a test case should be added for $-prefixed keys roundtripping through OpenAPI → Fern def → IR
• Note: there is a potential secondary issue where convertObject in convertExampleType.ts looks up typed properties by wire key — if the key is still \$ref at that point, it won't match a property named $ref. This is a separate concern not addressed here.

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