docs: record refactor step D5b (PR #99) and the confirmed jump_amount_corr look-ahead

[StackOverFlow11]

Progress-doc-only PR. Records: the confirmed look-ahead in jump_amount_corr_20 (independently reproduced by two parties on different symbols and windows; the sharper cut — perturbing only bars at/after 14:51 — moves 1,363/1,363 cells, i.e. the signal sees the minute it trades in and the nine after), why no existing test caught it, and the ruling that truncating applies a standing research-side authorization while still requiring its own correctness-fix PR; the delivered evaluation contract v1.0; the two MEDIUM findings (a guard that could not guard itself, and a false view=decision claim one level up) with the general rule the second one produced — a mismatch that destroys meaning must be blocked, one that only introduces a disclosed sign-known bias must be recorded; the three premise problems now ruled on and queued, including the store's universe dependence (amendment A2, queued as D4c before C4) whose date-only gap detection is the very red line amendment A1 invoked to reject caller-side batching; and two methodology notes. Merged-PR list gains #98/#99. AGENTS.md byte-identical via cp. No code changes.