feat: emit spec bus messages alongside legacy (PIPELINE-1 §8/§9.6, STOP-1 §4.2)

[JarbasAl]

What

Introduce a deployment-wide legacy_namespace config flag (default True) that
selects the bus-topic namespace during the mycroft.* → ovos.* transition. A skill
emits exactly one namespace (never both), so subscribers never see duplicate
messages — and skills subscribe on both so they work whichever namespace a producer
uses.

Logical event	legacy (legacy_namespace: true)	spec (legacy_namespace: false)
handler trio (PIPELINE-1 §8)	mycroft.skill.handler.start/.complete/.error	ovos.intent.handler.start/.complete/.error
speak (PIPELINE-1 §9.6)	speak	ovos.utterance.speak
stop pong (STOP-1 §4.2)	skill.stop.pong	ovos.stop.pong
stop subscribe (§4.2/§4.3/§5.3)	{skill}.stop.ping, mycroft.stop, {skill}.stop	also ovos.stop.ping, ovos.stop, {skill}:stop

Selection reads Configuration().get("legacy_namespace", True) per emit. No double-emit
(this avoids hacks like audio receiving speak twice).

Why first

Companion to ovos-core; merges first so core CI sees the skill-side behaviour. See also
ovos-dinkum-listener, ovos-simple-listener, ovos-audio companion PRs.

Tests

test/unittests/test_spec_bus_messages.py — both namespaces for the trio, speak and pong
(6 passed). Also exercised end-to-end by the ovos-core conformance suites.

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