Remove the patent strategy doc, keep the grant it carried

[blocksifrdev]

docs/patent-strategy.md is gone. It opened by naming two methods as patent-pending — a poor first impression for a protocol asking people to implement it — and the strategy framing around it served BlockSiFr rather than the reader.

But over half of it wasn't strategy. It carried an explicit royalty-free grant and three long-term commitments, and those answer the first question any adopter's counsel asks: will we be sued for implementing this?

Deleting the file wholesale would have removed the assurance along with the disclosure — and a withdrawn promise reads worse than one never made, particularly in a public repo where the deletion shows up in the diff.

So the grant moved to NOTICE, in BlockSiFr's own words rather than rewritten:

• The Apache 2.0 express patent grant covers implementing the spec — "if you implement what's in the spec, you're covered"
• The five royalty-free permissions (implement the protocol, use the reference aggregation algorithm commercially, build competing Trust Authorities, deploy internally, fork the reference implementations)
• The three commitments: never encumber the core spec, provide standards-body grants, flag new patent-pending mechanisms through the RFC process before they enter the normative spec

Also fixes two relative links left broken by the earlier docs move: protocol/spec.md → ../MVP.md and docs/README.md → ../COMMERCIAL_BOUNDARY.md.

🤖 Generated with Claude Code

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