SESSION-2: handler mutation-propagation discipline

[JarbasAl]

Extracted from the CONVERSE-1 feature PR (#25) per the 1 file, 1 PR rule — this is the only edit to ovos-session-2.md.

Change (ovos-session-2.md §2.4)

A handler that mutates session in-place but emits no Message has no bus-visible way to propagate those mutations. The handler-lifecycle trio .complete (PIPELINE-1 §8) is orchestrator-emitted from the dispatch context and does not reflect handler-side in-place changes (especially out-of-process). Such a handler MUST emit at least one Message (ovos.utterance.speak or ovos.session.sync per §2.7) for the state to appear in terminal events.

Clarification of existing behaviour — backwards-compatible (V1), Version unchanged. Adds the missing SESSION-2 CHANGELOG section.

CONVERSE-1 (#25) drops this companion edit and forward-references this PR.

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