Unwrap bracketed [path#TAG] headers at the top of WriteTool.execute() so internal-URL detection, plan-mode guard, plan path resolution, and ACP bridge routing all see the same filesystem target. Without this, ['/data/workspaces/can1357__oh-my-pi__2472/.omp-session/2026-06-13T20-19-47-341Z_019ec2a3-fc0d-7000-b1e6-25831d3c3ec5/local/scratch.md' slipped past isInternalUrlPath() and was bridged to the editor instead of staying on disk as a session-local artifact.\n\nFixes #2472
Route '/data/workspaces/can1357__oh-my-pi__1863/.omp-session/2026-06-04T13-36-11-717Z_019e92d9-3fc5-7000-a66f-15cad94b7e75/local' plan artifacts through OMP's session-local storage instead of the editor writeTextFile bridge, preserving ACP bridge routing for regular editor-visible files.
Fixes#1863