[sudo-tee]

Closes #562

Opening the session diff view left a leaked [No Name] buffer on each open. tabnew in M.open (lua/opencode/ui/session_diff.lua) creates a blank buffer that was replaced by the scratch list buffer via nvim_win_set_buf but never wiped, so it lingered as a listed buffer and accumulated across opens.

Set vim.bo.bufhidden = 'wipe' on the tabnew buffer before replacement so it is wiped when hidden.

[github-actions]

🏗️ Architecture check

Checks that require() calls between modules follow the layer rules in scripts/dependency-topology/topology.jsonc (entry → dispatch → services/UI → server/protocols; shared helpers usable everywhere).

Compared origin/main → HEAD.

	Before	After	Δ
Imports breaking layer rules	0	0	+0
Import loops	0	0	+0
Modules in largest loop	0	0	+0
Modules without a layer	0	0	+0

Imports between modules: +0 / -0

✅ No new problems

_{Run locally: make topology-check}