INTENT-3: required_slots and union slot sets for template intents

[JarbasAl]

Extracts the OVOS-INTENT-3 half of the union-slots / required_slots work into its own one-file PR (per 1 file, 1 PR).

Changes (ovos-intent-3.md)

• §5.1 — a template intent's templates MAY declare different slot sets; the engine extracts only the slots of the best-matching template (OVOS-INTENT-1 §5.5).
• §5.3 (new) — required_slots: an optional list of slot names the engine MUST extract for a match to be valid. A required slot must be declared by at least one template, otherwise the definition is malformed. Former §5.3 (Example) → §5.4, §5.4 (.blacklist) → §5.5; references updated.
• §7.1 — a handler MAY rely on required_slots being populated; all other slots remain optional and must be defended against.

Companion one-file PRs: INTENT-1 (union slots §5.5), INTENT-4 (required_slots payload + §6.2/§6.3), PIPELINE-1 (orchestrator backstop §6.2).

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