docs: add Dewey row 131 r2 packet (plug-in loader and setter fixes)
Round 2 for #1626 per sage-0314: F1a setter refuses a non-plain prototype,
F1b organization writer validates and logs JSON.parse(bytes), F2 loader
refuses unreadable paths, README top-level-code limit, control run.
Gate 591/0, 0 skipped; controls pass; mutants 47/47 killed (slot sage-0316).
Candidate manifest sha256 466c835f7dce79d20c7ab74c197a52b70e7fdeb0efae0456222dc6d0a633f219,
14 paths on base 0bdd573ff; no commit in base..1376caab9 touches them.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
jason.woltjeandClaude Opus 5.5
80797a5398