K.31 — Spesimen tangguhan CORRECTED: attestation by a REGISTERED officer (+ 8 UI fixes)

Deployed: ahu-ai-ocr:7971b686 @ 192.168.83.20:3520 (x056.ahu-demo.ocr.val.id) · 2026-07-16
Live demo submission: 4bff4444-106f-4f24-a455-f8fd94d757a0 (review) · board demo: bef. start submission with both lanes
Suites: backend 2703 (0 fail) · frontend 1015 (0 fail)

1. Your correction, applied

"The spesimen tangguhan that you provided is just Mulyoto's signature again, but the actual issue is that Mulyoto is not found and is not a registered pejabat. Therefore the spesimen tangguhan should be owned by a pejabat that is registered who acknowledges that the document (e.g. Ijazah SMA) is valid."

You were right, and the fix is structural, not cosmetic. K.30 modeled the attachment as the unregistered officer's own specimen sheet — self-certification, which proves nothing. The corrected model:

• Valid evidence = a "Keterangan Keabsahan" (FORMULIR 02 pattern) signed by a REGISTERED officer. The registry's own F02 form is exactly this: an authorized official attests that the named (retired/unregistered) officer really signed the document.
• The sheet's "Nama Pejabat" (top) names the document's signer → still the link key that maps the sheet to the right document.
• The closing-block signer (the attester) is who the AI verifies: the ink on the sheet is compared against the attester's registry specimen — a comparison that can actually succeed, because the attester IS in the registry.
• A FORMULIR 01 / legacy self-sheet still auto-links to its signer, but grades INVALID — the UI says so in red and tells the applicant what a valid attachment looks like.

Live result on staging: attester parsed off the real OCR, resolved to SARI NURLISTIANA (290996591, her own registry row), verify ran sheet-ink-vs-her-specimen → 44% advisory ("bandingkan manual" — honest, since the sample signature is synthetic).

Your test submission 4e2a4329 (the old self-sheet) now correctly shows the red "Lampiran tidak membuktikan keabsahan" state — that attachment was Mulyoto certifying Mulyoto.

2. The 8 UI asks

Card states now: blue = valid attestation · red = no evidence (un-acked) or worthless attachment · slate = acked-unregistered (the school-principal waiver, unchanged).

3. Bugs the live e2e caught (each pinned by a unit test before the fix shipped)

1. Date-above-signature layouts — the city+date stripper removed everything after "Garut, 16 Juli 2026", including the attester's name that follows it in OCR order. Now strips the phrase only; jabatan words ("Plt. Kepala Bidang…") became stopwords.
2. ALL-CAPS names — the live sheet prints "SARI NURLISTIANA, S.Sos., M.Si."; the mixed-case-only parser saw stamp noise and returned garbage ("Sos M Si"). Added a caps fallback that walks backward from the degree cluster and stops at the first stopword — only fires when no mixed-case name exists.
3. "Sarip" beat "Sari Nurlistiana" — namesAgree is OCR-tolerant (edit distance 1), so a stranger one letter away also "agreed", and unranked pool order picked him. Candidates now rank by exact-token overlap first.
4. Legalisasi blocked the sheet — the service gate only allowed Perdagangan under Legalisasi, so an attestation alongside a trade document was rejected as "wrong service". SPESIMEN_PEJABAT is now service-neutral (it backs a signer, not a service). The helper moved to apostille-guards.ts — the fitness ceiling on routes/apostille.ts forced the split, as designed.

4. Mechanics

• Schema dance #3 (your colleague's uncommitted schema/routes hunks): their diffs parked → my columns (sheetAttesterName, sheetAttesterSpesimenId, migration 20260716050000) committed alone → their hunks restored → client regenerated with both.
• Verify pair swap: for a tangguhan run the "document" side is the SHEET file and the specimen side is the attester's registry file; a manual box drawn on the ijazah no longer steers the sheet comparison; the focus click on the signer card targets the sheet.
• AP_SIGNER_UNREGISTERED warning now distinguishes "keterangan keabsahan oleh pejabat terdaftar X" from "lampiran terlampir, BUKAN pengesahan pejabat terdaftar".
• Corrected sample for your own testing: https://x056.think.val.id/keterangan-keabsahan-mulyoto.pdf (F02 naming Mulyoto, attested by the real registry officer Sari Nurlistiana).

5. Commits