v8.0.0

• chore: prepare 8.0.0 release
• feat(core): complete scoped capability architecture
• chore(deps): sync flow v1 revision
• fix(sdk): classify host-only session capabilities
• chore(core): update Flow compatibility revision
• feat(core): freeze projected MCP bindings per run
• feat(core): freeze projected hooks per run
• feat(core): freeze projected commands per run
• feat(core): freeze projected agents per run
• feat: add run-frozen tool presentation profiles
• docs(capability): mark HOST-CAP1 delivered
• feat(core): add atomic session capability runtime
• feat(core): add capability readiness DAG
• feat(capability): add atomic runtime projections
• feat(capability): add scoped lifecycle kernel
• feat(capability): add immutable capability sets
• docs(capability): record delivered Use bridge
• docs(capability): establish scoped architecture foundation
• chore: adopt bounded-retry Flow revision
• fix(serve): make AgentDir readiness fail closed (#65)