dcdpr / jp / 24383308914

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feat(cli, config): Accept JSON objects as `--cfg` values (#550)

The `--cfg` flag previously only accepted `key=value` pairs or file
paths. It now also accepts a JSON object literal, allowing users to pass
structured config overrides in a single argument.

For example:

    jp query --cfg '{"assistant": {"name": "dev"}}' "Hello"

is now equivalent to:

    jp query --cfg assistant.name=dev "Hello"

Internally, a JSON object is detected by a leading `{` and parsed via
`serde_json`. The resulting value is wrapped in a `KvAssignment` with an
empty key path (`root_json`). When `PartialAppConfig::assign` encounters
an empty key, it delegates to `try_merge_object`, which iterates the
object's top-level keys and assigns each individually. JSON and
key-value overrides can be freely mixed; later entries win.

Signed-off-by: Jean Mertz <git@jeanmertz.com>

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