docs: make agent decisions autonomous with a self-contained protocol

[dapi]

Closes #117

What changed

• replaced the implicit external FPF dependency with a self-contained Structured Decision Protocol;
• documented First Principles Framework (FPF) only as an optional source of deeper analysis, not a required skill or specification;
• made complexity and competing approaches inputs to the protocol rather than automatic Human Gates;
• added the canonical proceed | bounded_probe | escalate outcomes and autonomous tie-breakers;
• separated decision authority, durable decision records, and permission to execute externally effective actions;
• restricted Human Routing to missing authority or value judgments and risks that cannot be contained;
• kept P0 route classification read-only and routed experiments or broad evidence collection through Research Flow;
• aligned validation profiles so preparation remains autonomous and specific task/project-policy preauthorization can satisfy an applicable deployment approval;
• synchronized Bug Fix, Feature, Epic, routing, and epic decision-log governance.

Why

The previous policy mixed difficult reasoning with permission gates. The first revision also named FPF without defining whether downstream agents needed an external specification or skill. The template now contains the complete executable decision contract while preserving real production, security, compliance, communication, and scope boundaries.

Review fixes included

• removed the circular bounded_probe-before-routing path;
• reconciled deployment approvals with the canonical Human Gate;
• added direct governance dependencies where the protocol is applied;
• removed undefined FPF requirements from agent-facing governance documents.

Validation

• ruby tools/validate-priming-manifests.rb template/memory-bank
• memory-bank-cli lint --scope-root template/memory-bank --entrypoint template/memory-bank/README.md
• memory-bank-cli doctor --profile template
• git diff origin/main...HEAD --check

All checks pass on the current origin/main base.