docs: define combined human-control pilot

[yava-code]

Outcome

Defines the human study needed to falsify the combined v0.3 architecture without weakening autonomous coding.

What changed

• adds a four-condition R8 protocol: Autonomous, fixed Active comparator, Shadow control, and Full PureFlow;
• preserves full agentic production while testing Intent Ledger accountability, Executable Operator Model control, genuine Decision Future influence, and Takeover Envelope calibration;
• uses delayed AI-off adjacent-task completion as the behavioral primary outcome;
• adds ordered mechanism contrasts and kill rules so ineffective live authority/readiness mechanisms are removed rather than defended with confidence or explanation scores;
• updates experiment, execution, completion-audit, project-state, index, and build-log handoffs.

Honest boundary

This is a draft preregistration template, not participant evidence. Enrollment remains blocked by the complete two-rater R7 expert gate and an R5/R6 runtime capable of instantiating every condition. No retention, productivity, or usability result is claimed.

Local verification

• git diff --check
• edited local Markdown links resolve

Base: codex/shadow-cockpit-rnd. main is untouched.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[coderabbitai]

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