spec: VERSIONING.md — Version = compatibility class, Revision = within-class edit counter

[JarbasAl]

Defines the two-field spec-header model:

• Version — the V0/V1/V2 backward-compatibility class. Unchanged by a refinement; it answers only whether the contract is compatible with the pre-spec status quo.
• Revision — a monotonic within-class edit counter, starting at 1, bumped by every PR that alters normative content; non-normative edits do not bump it. A Version change (compatibility-class change) resets Revision to 1.

Replaces the dangling "editorial revisions bump the spec's own revision number" sentence with the full definition. This resolves the ambiguity that led refinement PRs to bump Version where a Revision bump was intended.

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Reviewing files that changed from the base of the PR and between 9003dcd and e80cf18.

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• VERSIONING.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch spec/versioning-revision

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