Wiki: Add Core-Test-Suite spoke page; correct window-activation docs after the 2026-10-01 revert; document test-only merge allowance for commits 2026-09-27 to 2026-10-04
Wiki: Add X87-FPU-Support, Shell-Interpreter, Agent-Issue-Pipeline spoke pages; update 14 pages for commits 2026-09-13 to 2026-09-27