PIPELINE-1: required_slots backstop, reserve fallback/common_query, listen field

[JarbasAl]

Consolidates the ovos-pipeline-1.md companion edits previously bundled into the union-slots (#56), FALLBACK-1 (#39), COMMON-QUERY-1 (#40) and AUDIO-1 (#38) feature PRs into a single one-file change — per the 1 file, 1 PR rule.

Changes

• §6.1 / §6.2 — orchestrator backstop for required_slots (INTENT-3 §5.3): after a plugin returns a Match, the orchestrator MUST treat it as declined if any required slot is absent. Second line of defense behind engine-side match() enforcement.
• §7.3 — reserve two further intent_names: fallback (FALLBACK-1 §6.3) and common_query (COMMON-QUERY-1 §3). COMMON-QUERY-1 asserted the reservation but never added the registry row — this closes that gap.
• §9.6 — add the OPTIONAL listen field to ovos.utterance.speak; the output-side behaviour is owned by AUDIO-1.

Compatibility: all additions are backwards-compatible. PIPELINE-1 is already V2 (its namespaced topics replace pre-spec names); these refinements don't change the class, so Version stays 2.

#56 / #39 / #40 / #38 drop their pipeline-1 companion edits and forward-reference this PR.

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