docs: define operator projection architecture

[yava-code]

What changed

• reframes Dual Source as a falsifiable product metaphor backed by one immutable evidence authority
• defines a pure Operator Projection, stale-base commitments, conflict handling, and derived evidence states
• adds explicit R5.1 accountability and R5.2 Decision Future runtime workstreams
• strengthens R8 with matched prebuilt alternatives, branch-independent transfer, and separate speculative cost
• triages current anti-atrophy tactics into comparators and adds causal checksum plus maintenance escrow

Evidence

• adversarial architecture review incorporated
• git diff --cached --check passed before commit
• local Markdown link validation passed

Claim boundary

This is architecture and a falsifiable execution plan. It does not claim an implemented Operator Projection, completed R7 human ratings, or measured skill preservation.

[gemini-code-assist]

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