Adds GitHub tracking title derivation so tasks can display meaningful titles when PR/issue tracking data is incomplete, falling back to the task description. The core implementation lives in `github-tracking.ts` with expanded test coverage across the tracking suite, and the feature is wired into pla
Fusion-Task-Id: FN-4148
Fusion-Task-Lineage: d57c6279-1b4f-4ade-9c3f-e20ac391ea45
Implements a tracking auth resolver with forced GitHub client authentication mode, wiring it across the GitHub tracking lifecycle and settings UI. The feature spans six steps: adding the resolver, forced auth mode, routing tracking issue creation through the resolver, and wiring into lifecycle and s
Fusion-Task-Id: FN-3875
