Clarify ExtractBench Pro challenge display names

Use task- and format-based challenge labels consistently across the dataset card: Charts, Relational diagrams, Document conventions, Custom terminology, Long dense pages, and Counting.

The labels identify visual structure, document-specific definitions, aggregation, or page geometry directly. They remove the ambiguous qualifier “house” and shorten redundant wording. Existing split identifiers remain stable so published commands, case IDs, file paths, and Harbor tasks retain their identity.

Only README prose changes. The YAML dataset configuration, all JSONL/PDF files, task packages, manifest, split membership, and scoring are unchanged. No benchmark rerun is needed.

Validation:
- [x] Compared the YAML front matter byte-for-byte with the current public card.
- [x] Reviewed the diff: only five display-name replacements and a compatibility note.
- [x] Upload contains README.md only and is guarded by the source commit.

Leave this PR unmerged pending coordinated review.

README.md

@@ -61,27 +61,29 @@ ExtractBench Pro contains 100 documents (2,622 pages, 1–83 pages each) across
 
 ## Challenge subsets
 
+Challenge labels describe the extraction task or page format. Published split identifiers, case IDs, file paths, and Harbor task identities remain stable for reproducibility. This naming update changes no documents, split membership, ground truth, or scoring.
+
 Each document belongs to exactly one subset: the challenge a naive reader most often gets wrong in it. A document can also contain values of other challenges, and values that are read directly from the page.
 
 | Subset | Challenge | Documents | Pages | Expected values |
 |---|---|---:|---:|---:|
 | `document_conventions` | **Document conventions.** One part of the document, such as a legend, rule or amendment, changes how the rest must be read | 22 | 875 | 121,287 |
-| `house_vocabulary` | **House vocabulary.** The organization’s own definitions of its jargon decide the value | 14 | 606 | 15,242 |
-| `house_counting_rules` | **House counting rules.** Counts and sums computed under definitions from the schema and the document | 12 | 225 | 409 |
-| `drawn_relations` | **Drawn relations.** All or part of the value depends on a line in a diagram rather than a printed value | 20 | 352 | 2,349 |
-| `charts_inside_documents` | **Charts inside documents.** Values read off charts, as the range between the tick marks the value falls in | 25 | 557 | 1,347 |
-| `long_chart_sheets` | **Long chart sheets.** Hundreds of values on one extremely long, narrow chart sheet, such as a well log or a time-location chart | 7 | 7 | 3,507 |
+| `house_vocabulary` | **Custom terminology.** The organization’s own definitions of its jargon decide the value | 14 | 606 | 15,242 |
+| `house_counting_rules` | **Counting.** Counts and sums computed under definitions from the schema and the document | 12 | 225 | 409 |
+| `drawn_relations` | **Relational diagrams.** All or part of the value depends on a line in a diagram rather than a printed value | 20 | 352 | 2,349 |
+| `charts_inside_documents` | **Charts.** Values read off charts, as the range between the tick marks the value falls in | 25 | 557 | 1,347 |
+| `long_chart_sheets` | **Long dense pages.** Hundreds of values on one extremely long, narrow chart sheet, such as a well log or a time-location chart | 7 | 7 | 3,507 |
 | **Total** | | **100** | **2,622** | **144,141** |
 
 <details>
   <summary>Document types per subset</summary>
 
 - **Document conventions:** GL trial balances (2), loss runs (2), regulations (2), utility invoices (2), benefits census, clinical listing, customs entry (CBP 7501), grant award form, insurance schedule, investor report, mortgage application (URLA 1003), patient record, payment remittance, payroll audit packet, property bulletin, SEC 13F report, UB-04 claim form, UCC search form
-- **House vocabulary:** care home census review, circulation audit, demand response settlement, export credit policy results, hotel room block review, import duty reconciliation, joint interest billing review, lab safety review, purchase contract review, school enrollment review, show entry check, spread betting account, subscription seat review, transit ridership review
-- **House counting rules:** college cohort file, container demurrage claim, election canvass binder, engine utilisation return, franchise royalty report, landfill diversion return, library aid claim, mortgage servicing report, premium audit worksheet, travel expense binder, TV post-buy affidavit, vendor statement reconciliation
-- **Drawn relations:** credit facility binders (2), fund structure files (2), HVAC balancing reports (2), insurance programme files (2), network change requests (2), one-line commissioning binders (2), water loss audits (2), audit findings report, capital call notice, fibre splice record, probate court file, procurement audit pack, tournament results pack
-- **Charts inside documents:** agency staffing invoice, aggregate QC report, assessment billing run, capacity change pack, chemotherapy verification, claims triage bundle, contractor dispute binder, dam operations report, drilling report bundle, earthwork quantity packet, eligibility appeals file, Gantt schedule board, integrity filing annex, medical gas shutdown notice, parking variance hearing, pipeline inspection report, pump station calculation, QT audit bulletin, rezoning notice packet, right-of-way acquisition packet, site plan review, stock declaration file, titration packet, tower coverage credit, well completion filing
-- **Long chart sheets:** wireline logs (3), time-location charts (2), borehole core log, track chart
+- **Custom terminology:** care home census review, circulation audit, demand response settlement, export credit policy results, hotel room block review, import duty reconciliation, joint interest billing review, lab safety review, purchase contract review, school enrollment review, show entry check, spread betting account, subscription seat review, transit ridership review
+- **Counting:** college cohort file, container demurrage claim, election canvass binder, engine utilisation return, franchise royalty report, landfill diversion return, library aid claim, mortgage servicing report, premium audit worksheet, travel expense binder, TV post-buy affidavit, vendor statement reconciliation
+- **Relational diagrams:** credit facility binders (2), fund structure files (2), HVAC balancing reports (2), insurance programme files (2), network change requests (2), one-line commissioning binders (2), water loss audits (2), audit findings report, capital call notice, fibre splice record, probate court file, procurement audit pack, tournament results pack
+- **Charts:** agency staffing invoice, aggregate QC report, assessment billing run, capacity change pack, chemotherapy verification, claims triage bundle, contractor dispute binder, dam operations report, drilling report bundle, earthwork quantity packet, eligibility appeals file, Gantt schedule board, integrity filing annex, medical gas shutdown notice, parking variance hearing, pipeline inspection report, pump station calculation, QT audit bulletin, rezoning notice packet, right-of-way acquisition packet, site plan review, stock declaration file, titration packet, tower coverage credit, well completion filing
+- **Long dense pages:** wireline logs (3), time-location charts (2), borehole core log, track chart
 
 </details>