cargo fmt --all --check failed on main with 5 drift sites in
crates/colibri-glasspane-tui/src/main.rs — all inside the tests added by #195,
which hand-packed Pane struct literals as `id: .., agent: .., state: ..,` on a
single line. rustfmt wants one field per line. Pure formatting: 91 insertions
/ 38 deletions, no logic change (only structural additions are field
continuations and one assert!(...) arg wrap).
Unblocks the fmt half of the workspace gate; second merged PR in a row (#193,
#195) to land fmt-red — worth tightening the CI fmt check as a required gate.
Verified: fmt clean workspace-wide, clippy -D warnings clean, 18/18 tests pass.
(Sam & Claude)
