feat(verticals): register Starlight Gravity Engine as a sovereign vertical

[frankxai]

Register Starlight Gravity Engine as a sovereign vertical

Registers the Starlight Gravity Engine (public, MIT) in the SIP registry — by reference, not by absorption.

What this adds

• VERTICALS.md — a new ### Starlight Gravity Engine entry under Sovereign verticals (operated): class, domain (Gravity = Direction × Signal × Contribution × Convening × Reliability), owner, status (v0.1 Field Edition), primary repo link, canon posture (declines), SIP attestation (pinned to starlightintelligence.org/protocol v1.1.1, emitted by the engine's publish gate), and its /gravity-* command surface.
• verticals/gravity-engine/README.md — a pointer-only in-repo surface that links out to the standalone repo and records the vertical's SIP posture, with a Built on SIP block.

What this deliberately does NOT do (per the architecture)

• Does not copy the engine's implementation into the substrate.
• Does not duplicate SIS memory infrastructure.
• Does not make SIS or ACOS required for the engine's fifteen-minute starter — the vertical is standalone and local-first, composing with SIS by attestation only.

Draft, not for merge. Companion draft PR opens the engine itself at frankxai/starlight-gravity-engine#1.

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