spec: msg-1.md — authoritative colon-vs-dotted topic rule; producer-side strictness for unknown keys

[JarbasAl]

Refines OVOS-MSG-1 to Version 2.

• §2.1.1 is now THE topic rule every other spec cites: : marks a dispatch-shaped topic assembled from identifiers (<skill_id>:<intent_name>), definable only by a formal spec; every other topic is dotted <x>.<y>.<verb> and MUST NOT contain :. A consumer can classify any topic with a single character test. Separator-hygiene rules restated per shape.
• §2 unknown top-level keys: producers MUST NOT emit; consumers SHOULD treat as malformed but MAY ignore — a hard reject would let one non-conformant emitter sever valid traffic bus-wide. §7 conformance aligned.
• §5.2: dst[0] RECOMMENDED as the reply source for array destinations (deterministic convergence); still implementation-defined, consumers MUST NOT rely on it.
• §3.1 walkthrough marked informative.
• CHANGELOG entry + Version bump to 2.

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