dcdpr / jp / 18750248659

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feat(config): Add merge strategy support for `system_prompt` field (#295)

`assistant.system_prompt` can now be configured with custom merge
strategies, allowing users to append to inherited prompts instead of
replacing them. The field is now optional, supporting five merge
strategies; `append`, `append_space`, `append_line`, `append_paragraph`,
and `replace` (default).

Users can configure this via CLI using either a simple string (which
uses `replace` strategy) or an object with explicit strategy:

```sh
jp query --cfg assistant.system_prompt="New prompt"
jp query --cfg assistant.system_prompt:='{"value":"Additional context","strategy":"append_space"}'
```

The change introduces a general infrastructure for merge strategies
through a new `jp_config::types` module. The `StringWithMerge` type
wraps strings with configurable merge behavior, serving as a foundation
for future config fields that need similar flexibility.

This lays groundwork for extending merge strategies to other config
options, enabling more sophisticated configuration layering and
inheritance patterns.

---------

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

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