docs: add JSDoc for aggregateSessionStats, displayStats, resolvePluginProviders

[OpenCode2026]

Adds JSDoc documentation to three exported functions:

1. aggregateSessionStats - stats.ts
2. displayStats - stats.ts
3. resolvePluginProviders - providers.ts

All functions lacked proper documentation.

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• No issue template was used. All issues must use one of the three templates: Bug Report, Feature Request, or Question.
• This appears to be a documentation/contribution task that would be better suited as a pull request rather than an issue.

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

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This issue might be a duplicate of existing issues. Please check:

• docs: add JSDoc for shouldAttachShareAuthHeaders function #17692: Same pattern — docs: add JSDoc for shouldAttachShareAuthHeaders function
• docs: add JSDoc for parseGitHubRemote function #17689: Same pattern — docs: add JSDoc for parseGitHubRemote function

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

This issue has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

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