Support non-code sources of information

[ruancomelli]

Describe the solution you'd like
Currently, Brag AI is able to generate brag documents or contribution summaries from commits only.
However, there's a plethora of rich information out there that could be used to generate contribution summaries.

For example:

• GitHub Issues also indicate contributions: discussing, planning, analyzing - those are all forms of non-code contributions;
• issues/tickets, where Vendor can be Jira, Asana and other project management tools

I believe the core technical enhancement necessary is abstracting over commits as the only representation of contributions.

Benefits
This would enable:

• individual contributors to generate contribution summaries from non-code contributions, such as "writing up issues" or "completed task X";
• managers to better understand their team's updates without the need for setting up standup calls, or require the contributors to write reports on their work.