spec: transformer.md — ascending priority + compose-once-per-utterance; Match.slots naming

[JarbasAl]

Refines OVOS-TRANSFORM-1 to Version 2.

• §4 priority order: ascending, 1 runs first, default 50; stated without external justification. A priority assignment authored for the inverse (descending) convention MUST be renumbered — the orderings are exact inverses, an unrenumbered chain runs backwards.
• §5.3 compose-once-per-utterance: the effective chain per injection point is composed once per utterance lifecycle from the session as committed at utterance start; mid-lifecycle mutations of <type>_transformers / blacklisted_<type>_transformers take effect on the next utterance. Composing from a live session would make the lifecycle's transformer surface depend on mutation timing.
• §3.4 slot naming: Match.slots (consistent with PIPELINE-1 §4.1); all captures wording renamed, See-also updated.
• ovos.intent.unmatched replaces the retired failure topic on the no-transcription path; still MUST NOT be emitted on the cancellation path.
• CONTEXT-1 citations repointed (§5.1 engine-side / §5.2 in-place / §5.3 ovos.session.sync); nonexistent bus mutation topics dropped; attribution precedence + cancellation-stamp rationale stated locally; SESSION-1 claims →§2.2; slot-typing deferrals made timeless out-of-scope statements.
• CHANGELOG entry + Version bump to 2.

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