the-framework.yml: support an event: key for the per-repo build event kind

[suleimansh]

#266 added --kind and a preset defaultEvent to pick which review loop fires (bug-fix vs major-change), but the per-repo config file the-framework.yml (#258) can set preset + modes, not the event kind. Add an event: key so a repo can pin its build event kind alongside preset/autopilot/technical.

Precedence: --kind flag > the-framework.yml event > preset defaultEvent > major-change. Finishes the config surface #266 deliberately left out to stay tight.

Closes the gap noted in #266.