[Dugongue]

This takes the suffix-sensitivity task left open by #4505. It adds an exact reverse free-word response for an additive logical defect after every scalar, warp, climb and center event in the complete original and rewritten THREE-base words, plus per-output/per-class rational error weights and universal sufficient perturbation/feedback theorems.

Under the explicit model that each entire-field ADD/SCALE defect has norm at most δ, the other modeled classes are exact, inputs are exact and logical free warps act isometrically, every persistent output error is bounded by 1,328 δ forward or 4,879 δ backward. Those worst-output constants are unchanged by #4505's 100-unit scalar saving. Unequal defect budgets use the full row ledger; the API requires an explicit nonnegative value for every present class. Initial persistent input error E0 contributes at most 2 E0. A caller-provided recursive defect contract can be closed using the sufficient feedback theorem in PROOF.md.

The 11/13 extra-bit corollary is about absolute entire-field logical defect tolerance, not machine mantissa width or a componentwise rounding quantum. Physical norm conversions, annotation errors and actual recursive defect contracts remain to be proved. No new κ or full rounded induction is claimed.

Coordinatewise nonregression does not follow: 33 forward and 90 backward row bounds change; individual increases reach 2 and 12. These are recorded explicitly. For ADD-only noise with all other classes exact, the backward maximum decreases from 4,308 to 4,300; this does not assert that physical SCALE is exact.

Checks pass: authenticated main source inputs and guarded #4505 rewrite; reverse endpoint columns for all 633 independent initial variables in both original/new words and both orientations; eight complete-suffix forward-injection comparisons; 720 all-event oracle checks on 30 small programs in both orientations, including noncommuting warps, clear/copy and signs; explicit class-budget and malformed-budget checks. Registered replay, committed-byte checks and isolated optimized Git-free export replay pass. Python standard library only; Windows tested, Linux execution unavailable.

python3 -I -O -B research/native-suffix-errors/verify.py
python3 scripts/research_package.py --package research/native-suffix-errors

Canonical main advanced during final refresh to f9f85c1. This branch is rebased onto it; guidance, selected record and the four frozen input bytes are unchanged. SOURCES.json preserves the initial frozen provenance base 2a13eb1, and its pins replay on the refreshed branch. No selected-frontier change.

Credit #4505 for guarded whole-word integration, #4502 for borrowed adapters, #4499 for gauges, #4494/#4489 for source selectors and rank sums, and the retained zxv / Jacob Alan Sussman / Cinna Davis / Jeremy Kothe native/compiler lineage. MathProof's explicit feedback lemmas are source-level precedents, not freshly checked Lean dependencies. ATTRIBUTION.md records overlap with #3181/#4501/#371 and incomplete Discussion/local-note coverage. Reverse sensitivity and impulse-response bounds are classical; the source-bound application and exact ledgers are the contribution. Substantial OpenAI assistance; Apache-2.0.