fix(install): shorten staging path segments to clear Windows MAX_PATH - #2941

Advisory evidence only. This check never authorizes implementation or merge.

State: needs-evidence. Candidate issue links are metadata, not proof the implementation matches scope. Fresh human confirmation remains required.

• Issue #2896: needs-evidence. Link an explicit human scope comment; labels, reviews and informal agreement are not evidence.

A current comment scan cannot detect a deleted withdrawal. Confirm current bounded scope,
implementation-to-scope match and review support with a responsible human.
Use CONTRIBUTING.md and the trusted default-branch GOVERNANCE.md roster.
Private security tracking stays private. No labels, milestones or code reviews substitute for scope approval.