A coordination is not a description, and one word is not a rebind

[WaylandYang]

Closes #595.

Two grammatical edges of the span check, each from one row of the recall-bench ledgers after #583.

A coordination is one item of a list

"SB Energy and SoftBank will build at least 10 GW of new energy generation" came out as subject SB Energy with subject_span: "SB Energy and SoftBank". Tier 4 reads a bound name followed by lowercase words as a modifier inside a larger phrase; and is lowercase, so the span was a description and a true partner_with fact was dropped.

and and & now join the articles as grammar words: after the bound name, a conjunction is skipped before the "do the following words look like names" test. SB Energy and SoftBank bound to SB Energy is kept; OpenAI and its investors bound to OpenAI is still a description; the span bound to the later item is the prefixed tier, as before.

One word is not a rebind

"Stockholders approved the election of each of our ten (10) director nominees" came out as subject NVIDIA with subject_span: "Stockholders", and the response also declared 2026 Annual Meeting of Stockholders of NVIDIA Corporation. Tier 3 rebinds a span whose words all sit inside another declared name and allowed a single word when it looked like a proper name. A sentence-initial capital is not that evidence, and the fact moved from NVIDIA to the meeting.

A single-word span no longer rebinds by containment; it rebinds only by exact or stem match, as slot_matches already does (Claude, GPT-3). Multi-word spans still rebind by containment (OpenAI's board → OpenAI's board of directors). No single-word containment rebind has been right in any ledger so far (#583's six runs, the two bench rounds); Altman bound to OpenAI becomes a counted coreference instead of a rebind, and the test says so.

Tests

• a_name_in_a_coordination_is_one_of_the_list: the SB Energy sentence with and and with &; bound to the later item; a conjunction followed by a description.
• a_span_that_names_a_description_is_not_the_entity: Altman and Stockholders as single words are coreferences, not rebinds.

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