Parity ledger: record B2's failure and the week's rulings

[MaxGhenis]

Brings docs/parity-ledger.md up to date at ad42ecc0 (18 October 2026). The main change: B2, the registered 2010→2014 transport test of the forward-earnings law, failed (#42 comment 6252752628). The ledger now records that in four places:

• the bottom line;
• the forward-earnings row, with the deciding cell and the attempt ledger;
• critical-path steps 1, 2 and 4;
• a new Gate failed status term in the legend.

It also brings forward every row that moved since the last verification at 216acab1:

• Earnings histories: gate_epuf_fill has locked and scored (Register gate_epuf_fill: learned career fills scored on held-out EPUF (awaiting ratification) #515, EPUF-learned career fills: candidates, PSID-2010 application, registered before TEST #516, gate_epuf_fill: the TEST result, scored once (both primaries adopted) #537). The careers' current fill rules fail it, the pre-career fill is certified, and the odd-year fill is adopted uncertified. d929 is parked.
• A worker's own benefit: ss.benefits.delayed_credit caps credits at 48 months, short for births 1917-1942 #494 is fixed beside the oracle (Add the statutory delayed-retirement credit beside the sealed oracle; erratum for #494 #532). The d1408 diagnostic (d1408: delayed-credit erratum diagnostic (counts and changes only) #538) found no published value changes. Track A v2's registration must choose the statutory window or disclose the cap.
• Family maximum and the earnings test:
  • R2 part (a) and R3 are built (Track B R2 (part a): the retirement earnings test ledger #528, Track B R3: adjustment of the reduction factor and automatic recomputation #529).
  • G v2 (Track B G v2: close #495, compute five refused configurations, register examples and refusal denominators #530) is open.
  • d1338's saving-clause reading is not yet built.
  • The next step is G part 2.
• Poverty / U2:
  • the loader is clear (U2: apply Max's d1090 ruling on blockers B1 and B2 #524, Apply Max's d637 ruling (amendments 1a-1c and 2-6) to the U2 source registries #540);
  • spec steps 1–3 are recorded (Record U2 §20 steps 2 and 3 and §17 items 4–7 and 9 #544);
  • step 4 is authorized (d1649), after Count B2's persons per Max's d1242 ruling #546 and the d1597 check.
• Starting population and SSI: Registration 19: SSI asset-test population run, with its released results #511 is merged and microcosm#1178 is fixed in build code (microcosm#1186). Four frame defects are open (microcosm#1212–#1215), and d947 is parked.
• Alignment: adds Gate W1's family-A marital and household targets come from a frame skewed toward couples; a source-faithful deployment fails 4 gated cells #531 on gate w1's family-A targets, and d1406.
• Rulings table: corrects d637, d745, d929, d947 and d1242. Adds d1338, d1406, d1408, d1414, d1418, d1597, d1606, d1649 and d1659.

How the facts were checked.

• An independent, read-only fact-check of every row and critical-path step at 2ef10532 listed 34 stale claims, each with its sources. A second Opus 5.5 agent tried to refute it, and its corrections were applied.
• I rechecked the facts that moved afterwards at ad42ecc0: Track B B2: run record (rescoped floor, score FAIL, first floor kept) #547 and Track B: start the cumulative attempt ledger (B2 attempt 1, FAIL) #548 merged, runs/track_b_b2_score.json reads outcome: FAIL (SHA-256 df82a102…), and d1659 is ruled.
• I checked each new rulings row against the decision log, and the delayed-credit sentence against docs/errata/2026-10-11-delayed-credit-window.md.
• All reference-style links resolve.

Scope. This PR changes docs only, with no tests and no tier change. The paper's forward-earnings and Earnings Public-Use File passages need the same update, so that follows in a separate PR.

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[MaxGhenis]

Merged at reviewed head 563afe9 (merge commit 5f917de) by the dynamics coordinator. Gates: gh pr checks exit 0, MERGEABLE, not a draft, no change requests. Docs only, so tier counts are unaffected.

Independent review ran four rounds, each on a standalone clone with a shell:

• Round 1 (GPT-6.1 Sol, 20261018-144640-md550-review-b): requested changes on four minor points. U2 step 4's F17 summaries, the scope of Gate failed, "components these gates certify", and the §203(a)(5) citation.
• Round 3 (Opus 5.5, 20261018-150125-md550-review-r3): confirmed those fixes, and checked the corrections carried from Paper: report B2's failure and gate_epuf_fill's scores #551 against code: household splits, 2013/2015 interviews, positive-earnings p90. It requested one wording fix, on what R2 part (b) readjusts.
• Round 4 (Opus 5.5, 20261019-124532-md550-review-r4): APPROVE at 563afe9.

Fact base: a read-only fact-check of every row at 2ef1053, refutation-checked by a second agent, then rechecked at ad42ecc for #547, #548 and d1659.