JSON-LD context uses wrong case sensitivity for types

Every example of JF2 shows that the items in the `type` array are lowercased, but the JSON-LD context defines them as Capitalcased:

```json
"Adr": "mf:h-adr",
"Card": "mf:h-card",
"Entry": "mf:h-entry",
"Feed": "mf:h-feed",
"Item": "mf:h-item",
"Listing": "mf:h-listing",
"Product": "mf:h-product",
"Recipe": "mf:h-recipe",
"Resume": "mf:h-resume",
"Review": "mf:h-review",
"Review-aggregate": "mf:h-review-aggregate",
"Cite": "mf:h-cite",
```

```json
"type": "entry",
```

```json
"type": "card",
```

```json
"type": "feed",
```

Locate the JSON-LD context definitions and compare their type keys with the lowercased type values shown in the issue examples. Update the context so the casing matches the examples, then verify that the affected JF2 examples resolve correctly.

Written by the indexing model from the issue text.