docs(debug-journal): fold in the 2026-10-02/03 queue slice (7 candidates); mark GH#5324 fixed by PR springfall2008#5348 and GH#5345 fixed by PR springfall2008#5347; add the startup API-error-fatal and SIG model-only-reserve rows

Co-Authored-By: Claude Code <noreply@anthropic.com>

Author: CI