spec: INTENT-1 — single-branch groups degenerate not malformed, structural adjacency check, timeless scoping

[JarbasAl]

Internal-purity refinement of OVOS-INTENT-1.

Changes

• Single-branch group (§3.2, §3.6): (word) moves from malformed to degenerate — loaders MUST accept it, SHOULD warn, and MUST treat it as exactly the bare branch ((word) ≡ word). The folding is semantically lossless: a construct with one unambiguous meaning is a stylistic slip, not an error. Only the empty () remains malformed (a group expresses a choice between branches; with no branch there is nothing to choose). §3.2 and §3.6 state the same rule consistently.
• Structural adjacent-slot detection (§3.6): the adjacent-slots check is defined over the expanded sample set, which can be expensive (§4.3). A tool MAY detect adjacency structurally, pre-expansion — two slots are adjacent iff every token between them can reduce to nothing — as a conformant alternative when it accepts and rejects exactly the same templates as the full-expansion check.
• Timeless scoping (§2, §5.3): "a future specification will define…" and "deferred to a future, separate specification" replaced with out-of-scope statements; "this draft" replaced with "this specification". §7's planned machine-checkable conformance-corpus sentence removed.
• Citation hygiene: §4.2 whitespace-normalization step number corrected (step 4); See-also corrected to six OVOS-INTENT-2 resource roles, five of which carry this grammar.

CHANGELOG entry appended under the spec's current class. Version field unchanged: per VERSIONING.md it is a V1/V2 compatibility class, and these refinements do not change class.

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