Function window_listing_entry 

pub(crate) fn window_listing_entry(w: &AgentMuxWindowInfo) -> Value

One DiscoverWindows entry.

A withheld (T3) window is LISTED but redacted, not omitted — reagentx P2 on PR #2845 caught two contradictions the omit-entirely approach created:

• the is_self fail-safe promised an unresolvable-pid window would “still surface … instead of hiding it”, which an unconditional drop broke (an unresolvable owner resolves to T3)
• this tool advertises capturable so a caller can “see why a window is out of reach before trying”, unreachable if every listed entry is capturable by construction

Redacting satisfies both while keeping the disclosure closed: title and exe_path (which embeds the owning OS username) are exactly what must not cross the human boundary, and they are the only fields dropped. A pid and “someone else owns this” are already available to anything with shell access, so surfacing them costs nothing — and it makes a wholesale user-id-resolution failure diagnosable instead of silently returning an empty list.