SD-297

[sd-collision-protocol] SD number collisions resolved by forward-ref, not rewrite — added to operational boot sequence. When an SD number appears twice (as SD-236 does: Feb 28 PoA and Mar 2 adversarial), the later entry gets a forward-ref annotation. Historical entries are never renumbered (SD-266, the chain). Convention added to dead-reckoning.md Step 2 as a structural note.

**STANDING ORDER**

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