Simplify spec further: 4 consensus changes from Prism 4+4 decision panel

Simplify spec by 21% (Prism 4+4 xhigh simplification pass)

Fix 26 flaws found by Prism 4+4 xhigh audit (round 4)

Fix 30+ flaws found by Prism 4+4 xhigh audit (rounds 1-2)

Fix 27 flaws found by Prism 4+4 xhigh audit (round 2)

Fix 20+ flaws found by Prism 4+4 audit across all pipeline phases

Fix three monolithic-task flaws: rebuttal, scout, and loop hill climbing

Update README to show write phase as a loop in pipeline diagram

Enhance write phase with section-by-section drafting and 4+4 revision passes

Add write phase with section-by-section drafting and revision passes

Fix setup instructions with correct plugin install steps

Initial commit: nanoresearch plugin