Option to add changeable defaults in goose-releases

[dorien-koelemeijer]

Summary

Add option to add changeable defaults in goose-releases. Currently, there's an option to add defaults in init-config and bundles.py - the former will only add defaults when there is no config file, and the latter will override everything (even the user's config). This PR adds defaults that will be added if the user hasn't set certain variables in their local config file, but will never override the user's config.

A PR will be made in goose-releases to add the defaults.yaml file and add some initial variables.

Type of Change

• Feature
• Bug fix
• Refactor / Code quality
• Performance improvement
• Documentation
• Tests
• Security fix
• Build / Release
• Other (specify below)

AI Assistance

• This PR was created or reviewed with AI assistance

Testing

Local/manual testing using just run-ui

[Copilot]

Pull request overview

Adds support for “changeable defaults” by introducing an optional defaults.yaml source that fills in missing config keys without overriding user-provided values, intended for goose-releases bundling.

Changes:

• Added defaults_path to Config and logic to load/merge defaults.yaml when keys are missing.
• Updated get_param documentation and adjusted all_values implementation.
• Added unit tests validating precedence: env > config > defaults, plus no-defaults behavior.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.